Fatty acid elongase 3-ketoacyl CoA synthase polypeptides

ABSTRACT

Elongase KCS polypeptides with altered substrate specificity and/or catalytic activity are disclosed. Such elongase KCS polypeptides are effective for producing very long chain fatty acids (VLCFA) fatty acids. Also disclosed are nucleic acids encoding elongase KCS polypeptides, and yeast and plants expressing these polypeptides.

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority under 35 U.S.C. §119(e) of U.S.provisional application serial No. 60/210,326, filed Jun. 8, 2000.

TECHNICAL FIELD

[0002] This invention relates to enzymes involved in very long chainfatty acid (VLCFA) synthesis, and more particularly to chimeras andmutants of nucleic acid sequences encoding fatty acid elongase3-ketoacyl CoA synthase polypeptides.

BACKGROUND

[0003] Plant seeds accumulate primarily 16- and 18-carbon fatty acids(FA). Plants also synthesize very long chain fatty acids (VLCFA). VLCFAsare saturated or unsaturated monocarboxylic acids with an unbranchedeven-numbered carbon chain that is greater than 18 carbons in length.Very long chain fatty acids are key components of many biologicallyimportant compounds in animals, plants, and microorganisms. For example,in animals, the VLCFA arachidonic acid is a precursor to manyprostaglandins. In plants, VLCFAs are major constituents oftriacylglycerols in many seed oils, are essential precursors forcuticular wax production, and are utilized in the synthesis ofglycosylceramides, a component of the plasma membrane. Important VLCFAsinclude arachidic acid (C20:0; i.e., a 20 carbon chain with no doublebonds), behenic acid (C22:0), erucic acid (C22:1), and lignoceric acid(C24:1).

[0004] VLCFAs are not desirable in edible oils. Oilseeds of theCrucifereae (e.g., rapeseed) and a few other plants, however, accumulateC20 and C22 fatty acids. Although plant breeders have developed rapeseedlines that have low levels of VLCFAs for edible oil purposes, even lowerlevels would be desirable. On the other hand, vegetable oils havingelevated levels of VLCFAs are desirable for certain industrial uses,including uses as lubricants, fuels and as a feedstock for plastics,pharmaceuticals and cosmetics.

[0005] The biosynthesis in plants of saturated fatty acids up to an18-carbon chain occurs in the chloroplast. C2 units from acyl thioestersare linked sequentially, beginning with the condensation of acetylCo-enzyme A (CoA) and malonyl-acyl carrier protein (malonyl-ACP) to forma C4 acyl fatty acid. This condensation reaction is catalyzed by a3-ketoacyl synthase III (KASIII). The enzyme 3-ketoacyl synthase I(KASI) catalyzes the stepwise condensation of a fatty acyl moiety (C4 toC14) with C2 groups and malonyl-ACP to produce a 3-ketoacyl-ACP productthat is 2 carbons longer than the original substrate (C6 to C16). Thelast condensation reaction in the chloroplast, converting C16 to C18, iscatalyzed by 3-ketoacyl synthase II (KASII). 3-ketoacyl moieties arealso referred to as β-ketoacyl moieties.

[0006] Each elongation cycle involves three additional enzymatic stepsin addition to the condensation reaction discussed above. Briefly, the3-ketoacyl condensation product is reduced to 3-hydroxyacyl-ACP,dehydrated to the enoyl-ACP, and reduced to an acyl-ACP. The fullyreduced fatty acyl-ACP reaction product then serves as the substrate forthe next cycle of elongation.

[0007] The C18:0 saturated fatty acid (stearic acid) can be desaturatedto produce a C18:1 fatty acid (oleic acid), which can be transported outof the chloroplast and converted to a C18:2 fatty acid (linoleic acid)or a C18:3 fatty acid (α-linolenic acid). Stearic acid and oleic acidcan also be elongated outside the chloroplast to form VLCFAs. Theformation of fatty acids longer than 18 carbons depends on the activityof a fatty acid elongase complex to carry out four reactions similar tothose described above for fatty acid synthesis in the chloroplast. Theinitial reaction is catalyzed by an elongase 3-ketoacyl CoA synthase(elongase KCS) and involves the condensation of a two carbon group frommalonyl CoA with a C18:0 or C18:1 fatty acyl CoA substrate. A geneencoding an elongase KCS from Arabidopsis thaliana has been identifiedand designated FAE1. See, e.g., U.S. Pat. No. 6,124,524. The geneproduct catalyzes the condensation of oleoyl CoA and malonyl CoA,leading to the conversion of the C18 substrate to a C20:1 product,eicosenoyl CoA. Mutations have been identified in the A. thaliana FAE1gene (see WO 96/13582). A. thaliana plants carrying a mutation in FAE1have significant decreases in the levels of VLCFAs in seeds.

SUMMARY

[0008] Despite 85% sequence identity at the amino acid level between theArabidopsis thaliana FAE1 polypeptide and the Brassica napus polypeptideof GenBank Accession No. AAB72178, the composition of the oil from A.thaliana and B. napus seeds suggests that the enzymes may have differentsubstrate specificities and/or catalytic activity. VLCFAs constituteabout 22% of the seed oil of A. thaliana, whereas VLCFAs constituteabout 62% of the seed oil in rape. A. thaliana seed oil is primarilyeicosenoic acid (about 18%), with a small amount of erucic acid andlonger-chain monunusaturated fatty acids (about 2%). In contrast,rapeseed oil has a relatively small amount of eicosenoic acid (about10%) and relatively larger amounts of erucic acid and longer-chainmonunsaturates (about 52%).

[0009] The present invention provides novel polypeptides with alteredelongase KCS substrate specificity and/or catalytic activity. One suchnovel polypeptide comprises three polypeptide segments. Theamino-terminal first polypeptide segment has membrane-anchoringproperties. It is joined to a second polypeptide segment whose aminoacid sequence is residues 75-114 of SEQ ID NO:12 or residues 75-114 ofSEQ ID NO:14, followed by a third polypeptide segment having at least40% sequence identity to the C-terminal 392 amino acids of SEQ ID NO:4.Examples of such polypeptides have the amino acid sequences shown in SEQID NOS:12 and 14. The third polypeptide segment can have an asparticacid residue at the position corresponding to amino acid 307 of SEQ IDNO:4. Examples of such polypeptides have the amino acid sequences shownin SEQ ID NOS:20, 22, 34 and 36.

[0010] Such polypeptides can catalyze the condensation of a C18 fattyacyl substrate and malonyl CoA, leading to the synthesis of a C20 fattyacyl CoA. The fatty acid substrate can be oleic acid (C18:1), in whichcase the product formed is eicosenoic acid (C20:1). In some instances,the fatty acid substrate is stearic acid (C18:0) and the product formedtherefrom is arachidic acid (C20:0). Such polypeptides often canfuirther catalyze the condensation of malonyl CoA and a C20 fatty acylsubstrate, leading to the synthesis of a C22 fatty acyl CoA. Thesubstrate often is eicosenoic acid (C20:1) and the product is erucicacid (C22:1). The ratio of the C22 fatty acid product to the C20 fattyacid product (C22:1/C20:1) resulting from the activity of suchpolypeptides can be about 0.20 or greater, about 0.30 or greater, about0.40 or greater, or about 0.50 or greater as measured in a yeastmicrosome assay.

[0011] The invention also features a polypeptide comprising in theamino-terminal to carboxy-terninal direction: a first polypeptidesegment that has membrane anchoring properties, joined to a secondpolypeptide segment that has residues 75-114 of SEQ ID NO:2, which is inturn joined to a third polypeptide segment that has at least 90%sequence identity to residues 115-506 of SEQ ID NO:4. An example of sucha polypeptide has the amino acid sequence of SEQ ID NO:8. Also featuredis a polypeptide comprising in the amino-terminal to carboxy-terminaldirection: a first polypeptide segment having at least 80% sequenceidentity to residues 1-74 of SEQ ID NO:2, joined to a second polypeptidesegment having residues 76-114 of SEQ ID NO:4, joined to a thirdpolypeptide segment having at least 40% sequence identity to residues115-506 of SEQ ID NO:4. An example of such a polypeptide has the aminoacid sequence of SEQ ID NO:10. In some embodiments of thesepolypeptides, the third segment has an aspartic acid at the positioncorresponding to amino acid 307 of said SEQ ID NO:4. Examples of suchpolypeptides have the amino acid sequences of SEQ ID NO:16 and SEQ IDNO:18.

[0012] A plant is also disclosed, comprising at least one exogenousnucleic acid encoding one or more of the novel polypeptides disclosedherein, as well as seeds having such nucleic acids.

[0013] Nucleic acid constructs of the invention comprise at least oneregulatory element operably linked to the nucleic acid coding sequencefor a novel polypeptide. Host cells containing such nucleic acidconstructs are disclosed. Such host cells include bacterial cells,fungal cells, insect cells, plant cells and animal cells.

[0014] A method of altering very long chain fatty acids in an organismis disclosed. The method comprises introducing an exogenous nucleic acidinto the organism. The nucleic acid encodes one or more of thepolypeptides described herein. The nucleic acid is expressed in theorganism to produce the polypeptide(s), and the very long chain fattyacid content of the organism is increased compared to the very longchain fatty acid content of a corresponding organism that lacks theexogenous nucleic acid or does not express the exogenous nucleic acid.Suitable organisms include fungi (e.g., yeast), plants, animals, insectsand bacteria. Such organisms can produce a higher level of erucic acidthan a corresponding organism that lacks or does not express theexogenous nucleic acid.

[0015] Unless otherwise defined, all technical and scientific terms usedherein have the same meaning as commonly understood by one of ordinaryskill in the art to which this invention belongs. For example, the oneletter and three letter abbreviations for amino acids and the one-letterabbreviations for nucleotides are commonly understood. Although methodsand materials similar or equivalent to those described herein can beused in the practice or testing of the present invention, suitablemethods and materials are described below. In addition, the materials,methods and examples are illustrative only and not intended to belimiting. All publications, patent applications, patents, and otherreferences mentioned herein are incorporated by reference in theirentirety. In case of conflict, the present specification, includingdefinitions, will control.

[0016] The details of one or more embodiments of the invention are setforth in the accompanying drawings and the description below. Otherfeatures, objects, and advantages of the invention will be apparent fromthe drawings and detailed description, and from the claims.

BRIEF DESCRIPTION OF SEQUENCES

[0017] SEQ ID NO:1 is the nucleotide sequence of the Arabidopsisthaliana FAE1 gene (GenBank Accession No. U29142).

[0018] SEQ ID NO:2 is the amino acid sequence of the polypeptide encodedby SEQ ID NO:1 (GenBank Accession No. AAA70154).

[0019] SEQ ID NO:3 is the nucleotide sequence of a Brassica napus fattyacid elongase KCS (GenBank Accession No. AF009563).

[0020] SEQ ID NO:4 is the amino acid sequence of the B. napuspolypeptide encoded by SEQ ID NO:3 (GenBank Accession No. AAB72178).

[0021] SEQ ID NO:5 is the nucleotide sequence of a B. napus fatty acidelongase KCS (GenBank Accession No. U50771).

[0022] SEQ ID NO:6 is the amino acid sequence of the B. napuspolypeptide encoded by SEQ ID NO:5 (GenBank Accession No. AAA96054).

[0023] SEQ ID NO:7 is a nucleotide sequence encoding a polypeptidedesignated At114.

[0024] SEQ ID NO:8 is the amino acid sequence of the polypeptide encodedby SEQ ID NO:7.

[0025] SEQ ID NO:9 is a nucleotide sequence encoding a polypeptidedesignated At74.

[0026] SEQ ID NO:10 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:9.

[0027] SEQ ID NO:11 is a nucleotide sequence encoding a polypeptidedesignated At114 L91C K92R.

[0028] SEQ ID NO:12 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:11.

[0029] SEQ ID NO:13 is a nucleotide sequence encoding a polypeptidedesignated At114 K92R.

[0030] SEQ ID NO:14 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:13.

[0031] SEQ ID NO:15 is a nucleotide sequence encoding a polypeptidedesignated At114 G307D.

[0032] SEQ ID NO:16 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:15.

[0033] SEQ ID NO:17 is a nucleotide sequence encoding a polypeptidedesignated At74 G306D.

[0034] SEQ ID NO:18 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:17.

[0035] SEQ ID NO:19 is a nucleotide sequence encoding a polypeptidedesignated At114 L91C K92R G307D.

[0036] SEQ ID NO:20 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:19.

[0037] SEQ ID NO:21 is a nucleotide sequence encoding a polypeptidedesignated At114 K92R G307D.

[0038] SEQ ID NO:22 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:21.

[0039] SEQ ID NO:23 is a nucleotide sequence encoding a polypeptidedesignated At254.

[0040] SEQ ID NO:24 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:23.

[0041] SEQ ID NO:25 is a nucleotide sequence encoding a polypeptidedesignated At173.

[0042] SEQ ID NO:26 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:25.

[0043] SEQ ID NO:27 is a nucleotide sequence encoding a polypeptidedesignated Bn176.

[0044] SEQ ID NO:28 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:27.

[0045] SEQ ID NO:29 is a nucleotide sequence encoding a polypeptidedesignated At399.

[0046] SEQ ID NO:30 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:29.

[0047] SEQ ID NO:31 is a nucleotide sequence encoding a polypeptidedesignated Bn399.

[0048] SEQ ID NO:32 is the amino acid-sequence of the polypeptideencoded by SEQ ID NO:31.

[0049] SEQ ID NO:33 is a nucleotide sequence encoding a polypeptidedesignated Bn G307D.

[0050] SEQ ID NO:34 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:33.

[0051] SEQ ID NO:35 is a nucleotide sequence encoding a polypeptidedesignated At K92R.

[0052] SEQ ID NO:36 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:35.

[0053] SEQ ID NO:37 is a nucleotide sequence encoding a polypeptidedesignated At254 G307D.

[0054] SEQ ID NO:38 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:37.

[0055] SEQ ID NO:39 is a nucleotide sequence encoding a polypeptidedesignated At173 G307D.

[0056] SEQ ID NO:40 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:39.

[0057] SEQ ID NO:41 is a nucleotide sequence encoding a polypeptidedesignated Bn399 G307D.

[0058] SEQ ID NO:42 is the amino acid sequence of the polypeptideencoded by SEQ ID NO:41.

[0059] SEQ ID NO:43 is the 3′ chimera-specific primer used in thegeneration of At173.

[0060] SEQ ID NO:44 is the 5′ chimera-specific primer used in thegeneration of At173.

[0061] SEQ ID NO:45 is the 3′ chimera-specific primer used in thegeneration of At114.

[0062] SEQ ID NO:46 is the 5′ chimera-specific primer used in thegeneration of At114.

[0063] SEQ ID NO:47 is the 3′ chimera-specific primer used in thegeneration of At74.

[0064] SEQ ID NO:48 is the 5′ chimera-specific primer used in thegeneration of At74.

[0065] SEQ ID NO:49 is the 3′ chimera-specific primer used in thegeneration of At114 L91C K92R.

[0066] SEQ ID NO:50 is the 5′ chimera-specific primer used in thegeneration of At114 L91C K92R.

[0067] SEQ ID NO:51 is the 3′ chimera-specific primer used in thegeneration of At114 K92R.

[0068] SEQ ID NO:52 is the 5′ chimera-specific primer used in thegeneration of At114 K92R.

[0069] SEQ ID NO:53 is the 5′ universal primer used in the generation ofAt-Bn chimeras.

[0070] SEQ ID NO:54 is the 3′ universal primer used in the generation ofAt-Bn chimeras.

[0071] SEQ ID NO:55 is the 5′ universal primer used in the generation ofBn-At chimeras.

[0072] SEQ ID NO:56 is the 3′ universal primer used in the generation ofBn-At chimeras.

DESCRIPTION OF DRAWINGS

[0073]FIG. 1 shows amino acid sequences of Brassica napus (Bn) elongaseKCS polypeptides, Arabidopsis thaliana FAE1 (At) and novel chimericpolypeptides and novel chimeric polypeptides containing site-directedmodifications. Sequences corresponding to those derived from At FAE1 areunderlined. Site-directed modifications are indicated in bold. One ofthe Bn elongase KCS sequences shown corresponds to GenBank AccessionNo., AAB72178; the other B. napus sequence shown corresponds to a secondB. napus elongase KCS having GenBank Accession No. AAA96054.

[0074]FIG. 2 shows nucleotide sequences of Bn elongase KCS, At FAE1 andnovel chimeric nucleic acids and novel chimeric nucleic acids containingsite-directed modifications. Sequences corresponding to those derivedfrom At FAE1 are underlined. Site-directed modifications are indicatedin bold. The two Bn elongase KCS nucleic acid. sequences shown encodethe two Bn polypeptides shown in FIG. 1. The GenBank Accession Numbersare AF009563 and U50771, respectively.

[0075] Like reference symbols in the various drawings indicate likeelements.

DETAILED DESCRIPTION

[0076] Fatty Acid Elongase KCS Polypeptides

[0077] In one aspect, the invention provides a polypeptide containingthe following segments in the amino-terminal to carboxy-terminaldirection: a first polypeptide segment having membrane anchoringproperties, joined to a second polypeptide segment having the amino acidsequence of residues of 75-114 of SEQ ID NO:12 or SEQ ID NO:14, joinedto a third polypeptide segment having at least 40% sequence identity tothe C-terminal approximately 392 amino acids of the Brassica napuselongase KCS polypeptide shown in SEQ ID NO:4. For example, polypeptidesdesignated At114 L91C K92R (SEQ ID NO:12) and At114 K92R (SEQ ID NO:14)are provided by the present invention. The primary sequence of the novelpolypeptides of the invention are identified by the source and number ofamino-terminal residues (e.g., At74 polypeptides have 74 amino-terminalresidues from Arabidopsis thaliana), and site-directed modifications areindicated by the original amino acid residue, the position of themodification and the new residue (e.g., polypeptides containing a K92Rsite-directed modification had a K at amino acid position 92 which wasmodified by site-directed mutagenesis of the nucleic acid to encode an Rresidue).

[0078] The above-described pdlypeptides include a first polypeptidesegment that can serve as a membrane anchor. Such a segment hasproperties that result in the elongase KCS polypeptide being anchored toa membrane, such as a lipid bilayer, detergent bilayer, micelle, or cellmembrane. Possession of membrane anchoring properties may be the resultof the primary structure, secondary structure and/or tertiary structureof the segment. For example, the segment may contain one or moretransmembrane domain(s). Alternatively, a post-translationalmodification of an amino acid residue within the segment can result inthe polypeptide being anchored to a membrane. Suitable modificationsinclude, but are not limited to, covalent attachment of a lipid (e.g., aglycosyl phosphatidylinositol anchor) or a carbohydrate (e.g., anoligosaccharide). See, Alberts et al., The Cell, 2^(nd) Edition, GarlandPublishing, New York, pp 284-298 and Lodish et al., Molecular CellBiology, 3^(rd) Edition, Scientific American Books, p. 604 and pp.688-692. The ability of a segment to serve as a membrane anchor can bedemonstrated by observing whether a polypeptide having such a segmentco-purifies with a membrane fraction. Alternatively, a segment can be amembrane-anchor if, after fusing it to the second and third segments, itis shown that the polypeptide possesses elongase KCS activity in an invitro yeast microsome assay, since elongase KCS polypeptides are activewhen anchored to a membrane. As another alternative, computeralgorithms, such as Predict Protein or META Predict Protein (seewww.emblheidelberg.de/predict-protein), can be used to predict thepresence of a transmembrane domain within a segment, and hence, theability of that polypeptide segment to serve as a membrane anchor.

[0079] Examples of polypeptide segments that can be membrane anchorsinclude, but are not limited to, amino acids 1-74 of A. thaliana FAE1(SEQ ID NO:2), and amino acid sequences having 40% or greater sequenceidentity to residues 1-74 of SEQ ID NO:2. For example, amino acids 1-75of an elongase KCS from B. napus (GenBank Accession No. AAB72178), aminoacids 1-75 of B. juncea protein (EMBL Accession No. CAA71898), aminoacids 1-75 of an elongase KCS from B. napus (GenBank Accession No.AAA96054), amino acids 29-105 of a putative β-ketoacyl-CoA synthase fromA. thaliana (GenBank Accession No. AAD22309) and amino acids 8-76 of afatty acid elongase-like protein from A. thaliana (EMBL Accession No.CAB36702) have at least 40% sequence identity to SEQ ID NO:2. In someembodiments, the first polypeptide segment has at least 80% sequenceidentity, 90% sequence identity, at least 95% sequence identity, or atleast 99% sequence identity to amino acids 1-74 of SEQ ID NO:2.

[0080] A percent identity for any subject nucleic acid or amino acidsequence (e.g., any of the fatty acid elongase chimeras describedherein) relative to another “target” nucleic acid or amino acid sequencecan be determined as follows. First, a target nucleic acid or amino acidsequence of the invention can be compared and aligned to a subjectnucleic acid or amino acid sequence, preferably using the BLAST 2Sequences (Bl2seq) program from the stand-alone version of BLASTZcontaining BLASTN and BLASTP (e.g., version 2.0.14). The stand-aloneversion of BLASTZ can be obtained at <www.fr.com> or<www.ncbi.nlm.nih.gov>. Instructions explaining how to use BLASTZ, andspecifically the Bl2seq program, can be found in the ‘readme’ fileaccompanying BLASTZ. The programs also are described in detail by Karlinet al. (Proc. Natl. Acad. Sci. USA, 87:2264 (1990) and 90:5873 (1993))and Altschul et al. (Nucl. Acids Res., 25:3389 (1997)).

[0081] Bl2seq performs a comparison between the subject sequence and atarget sequence using either the BLASTN (used to compare nucleic acidsequences) or BLASTP (used to compare amino acid sequences) algorithm.Typically, the default parameters of a BLOSUM62 scoring matrix, gapexistence cost of 11, a per residue cost of 1 and a lambda ratio of 0.85are used when performing amino acid sequence alignments. The output filecontains aligned regions of homology between the target sequence and thesubject sequence. Once aligned, a length is determined by counting thenumber of consecutive nucleotides or amino acid residues (i.e.,excluding gaps) from the target sequence that align with sequence fromthe subject sequence starting with any matched position and ending withany other matched position. A matched position is any position where anidentical nucleotide or amino acid residue is present in both the targetand subject sequence. Gaps of one or more residues can be inserted intoa target or subject sequence to maximize sequence alignments betweenstructurally conserved domains (e.g., α-helices, β-sheets, and loops).

[0082] The percent identity over a particular length is determined bycounting the number of matched positions over that particular length,dividing that number by the length and multiplying the resulting valueby 100. For example, if (i) a 1000 nucleotide target sequence iscompared to a subject nucleic acid sequence (e.g., SEQ ID NO:21), (ii)the Bl2seq program presents 200 nucleotides from the target sequencealigned with a region of the subject sequence where the first and lastnucleotides of that 200 nucleotide region are matches, and (iii) thenumber of matches over those 200 aligned nucleotides is 180, then the1000 nucleotide target sequence contains a length of 200 and a percentidentity over that length of 90 (i.e., 180÷200×100=90).

[0083] It will be appreciated that a nucleic acid or amino acid targetsequence that aligns with a subject sequence can result in manydifferent lengths with each length having its own percent identity. Itis noted that the percent identity value can be rounded to the nearesttenth. For example, 78.11, 78.12, 78.13, and 78.14 is rounded down to78.1, while 78.15, 78.16, 78.17, 78.18, and 78.19 is rounded up to 78.2.It is also noted that the length value will always be an integer.

[0084] Polypeptides of the invention have a second segmnent whichcontains amino acid residues, in particular, the amino acid residuecorresponding to position 92 in SEQ ID NO:2, that affect elongase KCSsubstrate specificity. If the residue at position 92 is an arginineresidue, the ratio of the C22:1 product to the C20:1 product is higherthan the corresponding ratio observed when the residue is a lysine.Accordingly, the second segment (residues 75-114) of At114 L91C K92R andAt114 K92R both possess an R at position 92. Another example of such apolypeptide has the amino acid sequence of SEQ ID NO:2, except that thelysine at amino acid residue 92 is replaced with an arginine. Thispolypeptide, designated At K92R, has the amino acid sequence shown inSEQ ID NO:36.

[0085] Some polypeptides of the invention have a third segment that hasat least 40% sequence identity to residues 115-506 of SEQ ID NO:4, whichare the carboxy-terminal 392 amino acids of the B. napus polypeptide. Insome embodiments, the third polypeptide segment has at least 50%sequence identity, at least 60% sequence identity, at least 70%, 80%,90%, 95% or 99% sequence identity to the carboxy-terminal 392 aminoacids of SEQ ID NO:4.

[0086] In some embodiments, the third segment has an aspartic acidresidue at the position corresponding to amino acid residue 307 of SEQID NO:4. An aspartic acid residue at this position is useful forincreasing the catalytic activity of an elongase KCS, compared to thecatalytic activity of an otherwise similar polypeptide that has aglycine at this position. For example, polypeptides designated At114G307D, At74 G306D, At114 L91C K92R G307D, At114 K92R G307D, At254 G307D,At173 G307D, Bn G307D and Bn399 G307D have an aspartic acid residue atthe position corresponding to residue 307 of SEQ ID NO:4. Thesepolypeptides have SEQ ID NOS:16, 18, 20, 22, 38, 40, 34 and 42,respectively.

[0087] In some embodiments, the third segment contains one or more ofthe following groups of residues: GNTSSSS at positions corresponding toresidues 423-429 of SEQ ID NO:4, HAGG(R/K)A at positions correspondingto residues 391-396 of SEQ ID NO:4, or MGCSAG at positions correspondingto residues 221-226 of SEQ ID NO:4. These groups of residues are amongthose that are conserved among elongase KCS polypeptides and are thusfound in preferred embodiments.

[0088] Segments of a polypeptide are joined to one another by covalentbonds, typically peptide bonds. The segments can be joined directly,without any intervening residues between two segments. Alternatively,one segment can be joined indirectly to an adjacent segment by aminoacid residues that are situated between the two adjacent segments andare themselves covalently joined to the adjacent segments. In someembodiments, there are one, two or three intervening amino acidresidues. In other embodiments, there are four, five, six, seven, eight,nine or ten intervening residues.

[0089] A polypeptide of the invention optionally can possess additionalamino acid residues at the amino-terminus or the carboxy-terminus. Forexample, six His-tag or FLAG™ residues may be linked to a polypeptide atthe amino-terminus. See, e.g., U.S. Pat. Nos. 4,851,341 and 5,001,912. Areporter polypeptide, such as green fluorescent protein, may be fused tothe carboxy-terminus. See, for example, U.S. Pat. No. 5,491,084. Withrespect to polypeptides, “isolated” refers to a polypeptide thatconstitutes the major component in a mixture of components, e.g., 30% ormore, 40% or more, 50% or more, 60% or more, 70% or more, 80% or more,90% or more, or 95% or more by weight. Isolated polypeptides typicallyare obtained by purification from an organism that makes thepolypeptide, although chemical synthesis is also feasible. As usedherein, “enriched” refers to a polypeptide that constitutes 20-30% (byweight) of a mixture of components. Methods of polypeptide purificationinclude, for example, chromatography or immunoaffinity techniques.

[0090] A polypeptide of the invention may be detected by sodium dodecylsulphate (SDS)-polyacrylamide gel electrophoresis followed by CoomassieBlue-staining or Western blot analysis using monoclonal or polyclonalantibodies that have binding affinity for the polypeptide to bedetected.

[0091] The presence of a polypeptide of the invention may often bedetected by measuring elongase KCS activity. An elongase KCS cancatalyze the condensation of a C18 fatty acyl substrate and malonyl CoA,leading to the formation of a C20 fatty acyl product. C18 fatty acidsinclude C18:0 (e.g., stearic acid), C18:1 (e.g., oleic acid), C18:2(e.g., linoleic acid), and C18:3 (e.g., α-linolenic acid). In someembodiments, an elongase KCS can catalyze the conversion of a C20 fattyacyl substrate to a C22 fatty acyl product. An example of a C20:1 fattyacyl substrate is an eicosenoyl substrate. Such a substrate can beconverted to a C22:1 fatty acyl product, e.g., an erucyl product.

[0092] Some polypeptides may result in an elongase KCS that does notform reaction product(s) at a desired rate. Such elongases and theirgenes are useful as controls in analyses of product formation byenzymatically active elongase KCS polypeptides. Such inactive elongaseKCS polypeptides and their genes can also be useful in studying theregulation (e.g., transcription, translation, and post-translationalevents) of genes encoding enzymatically active elongase KCSpolypeptides. Such elongase KCS polypeptides can be attached toSepharose beads and used for affinity purification of fatty acylsubstrates from crude preparations. In addition, such elongase KCSpolypeptides and their genes can also be useful to develop reagents forvarious purposes, e.g., immunological reagents to monitor expression ofa elongase KCS polypeptides or nucleic acid probes or primers to monitorinheritance of a elongase KCS gene in a plant breeding program.

[0093] Products formed in plants by elongase reactions involving anelongase KCS can be subsequently used to form fatty acyltriacylglycerides (TAGs) during seed development. Alternatively, suchproducts can be further elongated to form cuticular lipids, such aswaxes.

[0094] In yet another aspect, the invention provides a polypeptidecontaining the following segments in the amino-terminal tocarboxy-terminal direction: a first polypeptide segment having at least80% sequence identity to the first 74 amino acids of the A. thalianaFAE1 gene product (SEQ ID NO:2), joined to a second polypeptide segmenthaving amino acids 76-114 of SEQ ID NO:4, joined to a third polypeptidesegment having at least 40% sequence identity to the C-terminal 392amino acids of a B. napus elongase KCS (SEQ ID NO:4). An example of sucha polypeptide is At74 (SEQ ID NO:10). This polypeptide possesses an Rresidue at position 92. Another example is At74 G306D (SEQ ID NO:18),which has a D residue at position 306.

[0095] Another novel polypeptide disclosed herein contains the followingsegments in the amino-terminal to carboxy-terminal direction: a firstpolypeptide segment having membrane anchoring properties, joined to asecond polypeptide segment corresponding to amino acids 75-114 of SEQ IDNO:2, joined to a third polypeptide segment having at least 90% sequenceidentity to the C-terminal 392 amino acids of SEQ ID NO:4. An example ofsuch a polypeptide is At114 (SEQ ID NO:8).

[0096] The invention also features the following polypeptide, comprisingin the amino-terminal to carboxy-terminal direction: (a) a firstpolypeptide segment having at least 90% sequence identity to residues1-254 of SEQ ID NO:2, joined to (b) a second polypeptide segment havingthe amino acid sequence of residues 255-506 of SEQ ID NO:4. An exampleof such a polypeptide is designated At254 and the amino acid sequence isshown in FIG. 1 and SEQ ID NO:24.

[0097] Another novel polypeptide comprises (a) a first polypeptidesegment having at least 85% sequence identity to residues 1-173 of SEQID NO:2, joined to (b) a second polypeptide segment having the aminoacid sequence of residues 174-506 of SEQ ID NO:4. An example of such apolypeptide is designated At173 and the amino acid sequence is shown inFIG. 1 and SEQ ID NO:26.

[0098] Another novel polypeptide comprises: (a) a first polypeptidesegment having at least 90% sequence identity to residues 1-399 of SEQID NO:2, joined to (b) a second polypeptide segment having amino acidresidues 400-506 of SEQ ID NO:4. An example of such a polypeptide isdesignated At399 and the amino acid sequence is shown in FIG. 1 and SEQID NO:30. Such a polypeptide can exhibit a product ratio and catalyticactivity resembling that of wild-type At FAE1.

[0099] The invention also features the following polypeptide,comrprising in the amino-terminal to carboxy-terminal direction: (a) afirst polypeptide segment having amino acid residues 1-176 of SEQ IDNO:4, joined to (b) a second polypeptide segment having at least 95%sequence identity to residues 177-506 of SEQ ID NO:2. An example of sucha polypeptide is designated Bn176 and the amino acid sequence is shownin FIG. 1 and SEQ ID NO:28. In yeast microsome assays, the Bn176polypeptide exhibits detectable elongase KCS catalytic activity and aC21:1/C20:1 product ratio of about 0.51.

[0100] The invention also features the following polypeptide, comprisingin the amino-terminal to carboxy-terminal direction: (a) a firstpolypeptide segment having amino acid residues 1-399 of SEQ ID NO:4,joined to (b) a second polypeptide segment having at least 95% sequenceidentity to residues 400-506 of SEQ ID NO:2. An example of such apolypeptide is designated Bn399 and the amino acid sequence is shown inFIG. 1 and SEQ ID NO:32. In yeast microsome assays, the Bn399polypeptide exhibits detectable elongase KCS catalytic activity and aC21:1/C20:1 product ratio of about 0.35.

[0101] Elongase KCS Nucleic Acids and Constructs

[0102] The present invention also includes nucleic acids encoding theabove-described polypeptides. As used herein, nucleic acid refers to RNAor DNA, including cDNA, synthetic DNA or genomic DNA. The nucleic acidsmay be single- or double-stranded, and if single-stranded, may be eitherthe coding or non-coding strand. As used herein with respect to nucleicacids, “isolated” refers to (i) a naturally-occurring nucleic acidencoding part or all of a polypeptide of the invention, but free ofsequences, i.e., coding sequences, that normally flank one or both sidesof the nucleic acid encoding polypeptide in a genome; (ii) a nucleicacid incorporated into a vector or into the genomic DNA of an organismsuch that the resulting molecule is not identical to anynaturally-occurring vector or genomic DNA; or (iii) a cDNA, a genomicnucleic acid fragment, a fragment produced by polymerase chain reaction(PCR) or a restriction fragment. Specifically excluded from thisdefinition are nucleic acids present in mixtures of nucleic acidmolecules or cells.

[0103] Examples of such nucleic acids include those encodingpolypeptides designated At114, At74, At114 L91C K92R, At114 K92R, At114G307D, At74 G306D, At114 L91C K92R G307D, At114 K92R G307D, At254,At173, Bn176, At399, Bn399 and At K92R. These nucleic acids have SEQ IDNOS: 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31 and 35,respectively. It should be appreciated that nucleic acids having anucleotide sequence other than the specific nucleotide sequencesdisclosed can still encode a polypeptide having the exemplified aminoacid sequence. The degeneracy of the genetic code is well known to theart; i.e., for many amino acids, there is more than one nucleotidetriplet that serves as the codon for the amino acid.

[0104] Further provided are nucleic acid constructs comprising theabove-described nucleic acid coding sequences. Such constructs may beincorporated into a cloning vector. Cloning vectors suitable for use inthe present invention are commercially available and used routinely bythose of ordinary skill. Nucleic acid constructs of the invention mayadditionally comprise one or more regulatory elements operably linked toa nucleic acid coding sequence. Such regulatory elements may includepromoter sequences, enhancer sequences, response elements or inducibleelements that modulate expression of a nucleic acid sequence. As usedherein, “operably linked” refers to positioning of a regulatory elementin a construct relative to a nucleic acid coding sequence in such a wayas to permit or facilitate expression of the encoded polypeptide. Thechoice of element(s) that may be included depends upon several factors,including, but not limited to, replication efficiency, selectability,inducibility, targeting, the level of expression desired, ease ofrecovery and the ability of the host to perform post-translationalmodifications.

[0105] The term “host” or “host cell” includes not only prokaryotes,such as E. coli, but also eukaryotes, such as fungal, insect, plant andanimal cells. Animal cells include, for example, COS cells and HeLacells. Fungal cells include yeast cells, such as Saccharomycescereviseae cells. A host cell can be transformed or transfected with aDNA molecule (e.g., a vector) using techniques known to those ofordinary skill in this art, such as calcium phosphate or lithium acetateprecipitation, electroporation, lipofection and particle bombardment.Host cells containing a vector of the present invention may be used forsuch purposes as propagating the vector, producing a nucleic acid (e.g.,DNA, RNA, antisense RNA) or expressing a polypeptide or fragmentsthereof.

[0106] A nucleic acid encoding a novel polypeptide of the invention maybe obtained using standard molecular biology techniques, for example,molecular cloning, DNA synthesis, and the polymerase chain reaction(PCR). PCR refers to a procedure or technique in which target nucleicacids are amplified. PCR can be used to amplify specific sequences fromDNA as well as RNA, including sequences from total genomic DNA or totalcellular RNA. Various PCR methods are described, for example, in PCRPrimer: A Laboratory Manual, Dieffenbach, C. & Dveksler, G., Eds., ColdSpring Harbor Laboratory Press, 1995. Generally, sequence informationfrom the ends of the region of interest or beyond is employed to designoligonucleotide primers that are identical or similar in sequence toopposite strands of the template to be amplified. Various PCR strategiesare available by which site-specific nucleotide sequence modificationscan be introduced into a template nucleic acid.

[0107] Nucleic acids of the present invention may be detected by methodssuch as ethidium bromide staining of agarose gels, Southern or Northernblot hybridization, PCR or in situ hybridizations. Hybridizationtypically involves Southern or Northern blotting (see, for example,sections 9.37-9.52 of Sambrook et al., 1989, “Molecular Cloning, ALaboratory Manual”, 2^(nd) Edition, Cold Spring Harbor Press, Plainview;N.Y.). Probes should hybridize under high stringency conditions to anucleic acid or the complement thereof. High stringency conditions caninclude the use of low ionic strength and high temperature washes, forexample 0.015 M NaCl/0.0015 M sodium citrate (0.1× SSC), 0.1% sodiumdodecyl sulfate (SDS) at 65° C. In addition, denaturing agents, such asformamide, can be employed during high stringency hybridization, e.g.,50% formamide with 0.1% bovine serum albumin/0.1% Ficoll/0.1%polyvinylpyrrolidone/50 mM sodium phosphate buffer at pH 6.5 with 750 mMNaCl, 75 mM sodium citrate at 42° C.

[0108] Transgenic Plants

[0109] The invention provides a plant containing an exogenous nucleicacid that encodes a polypeptide of the invention, e.g., nucleic acidsencoding a polypeptide having an amino acid sequence as shown in SEQ IDNOS:8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, or 36.

[0110] Accordingly, a method according to the invention comprisesintroducing a nucleic acid construct into a plant cell and producing aplant (and progeny of such a plant) from the transformed cell.Techniques for introducing exogenous nucleic acids into monocotyledonousand dicotyledonous plants are known in the art, and include, withoutlimitation, Agrobacterium-mediated transformation, viral vector-mediatedtransformation, electroporation and particle gun transformation, e.g.,U.S. Pat. Nos. 5,204,253 and 6,013,863. If cell or tissue cultures areused as the recipient tissue for transformation, plants can beregenerated from transformed cultures by techniques known to thoseskilled in the art. Transgenic plants may be entered into a breedingprogram, e.g., to introduce a nucleic acid encoding a polypeptide intoother lines, to transfer the nucleic acid to other species or forfurther selection of other desirable traits. Alternatively, transgenicplants may be propagated vegetatively for those species amenable to suchtechniques. Progeny includes descendants of a particular plant or plantline. Progeny of an instant plant include seeds formed on F₁, F₂, F₃,and subsequent generation plants, or seeds formed on BC₁, BC₂, BC₃, andsubsequent generation plants. Seeds produced by a transgenic plant canbe grown and then selfed (or outcrossed and selfed) to obtain seedshomozygous for the nucleic acid encoding a novel polypeptide.

[0111] In another aspect, the invention provides a method of alteringvery long chain fatty acids in an organism. The method involvesintroducing an exogenous nucleic acid into the organism. The organismmay be, for example, a yeast or a plant. A nucleic acid construct of theinvention can alter the levels of very long chain fatty acids in planttissues expressing the novel polypeptide, compared to VLCFA levels incorresponding tissues from a plant, that does not contain or does notexpress the polypeptide. A comparison can be made, for example, betweena transgenic plant of a plant line and a plant of the same line thatlacks the nucleic acid construct or does not express the nucleic acidconstruct in that tissue. Plants having an altered VLCFA composition maybe identified by techniques known to the skilled artisan, e.g., thinlayer chromatographic or gas-liquid chromatographic (GLC) analysis ofthe appropriate plant tissue. Novel polypeptides can catalyze theconversion of oleic acid (18:1) to eicosenoic acid (20:1), and theconversion of eicosenoic acid to erucic acid (22:1). In someembodiments, the ratio of erucic acid to eicosenoic acid (22:1/20:1) isgreater than or equal to 0.20, as measured in the yeast microsome assaydescribed below.

[0112] A suitable group of plants with which to practice the inventioninclude dicots, such as alfalfa, soybean, rapeseed (high erucic andcanola), safflower, or sunflower, and monocots, such as corn, wheat,rye, barley, rice, or sorghum. Suitable rapeseed species include B.napus, B. rapa, B. juncea, and B. hirta. Additional plant speciessuitable for use in the present invention include Sinapsis alba, Crambeabyssinica, Limnanthes douglasii and L. alba.

[0113] Suitable tissues in which to express polynucleotides and/orpolypeptides of the invention include, without limitation, seeds, stemsand leaves. Seeds expressing a novel coding sequence can be used toextract an oil having elevated levels of eicosenoic acid and/or erucicacid. Leaf tissues in which a novel coding sequence can be expressedinclude cells and tissues of the epidermis, e.g., cells that areinvolved in forming trichomes. Also of interest are epidermal cellsinvolved in forming the cuticular layer. The cuticular layer comprisesvarious very long chain fatty acids and VLCFA derivatives such asalkanes, esters, alcohols and aldehydes. Increasing the amount of VLCFAsin epidermal cells and tissues may enhance defense mechanisms anddrought tolerance of plants.

[0114] The invention will be further described in the followingexamples, which do not limit the scope of the invention described in theclaims.

EXAMPLES Example 1 Construction and Cloning of Nucleic Acids

[0115] Nucleic acids encoding chimeric polypeptides were generated by anoverlap polymerase chain reaction (PCR) strategy. Horton et al. (1989),Gene, 77:61-68 and see FIG. 1 of Ho et al. (1989), Gene, 77:51-59.Briefly, a first round of PCR products were generated in separatereactions using Arabidopsis thaliana FAE1 and Brassica napus elongaseKCS nucleic acid as template. Nucleic acid sequences of the A. thalianaFAE1 and B. napus elongase KCS templates are shown in SEQ ID NO:1 and 3,respectively. The portion of each template that was amplifiedcorresponded to the segment to be combined in a desired chimera. Theamino-terminal fragment of a given chimera was amplified using a 5′universal primer (sense) and a 3′ chimera-specific primer (anti-sense).The carboxy-terminal fragment of a given chimera was amplified with a 5′chimera-specific primer (sense) and a 3′ universal primer (anti-sense).Universal primer sequences are shown in Table 1 and SED ID NOS:53-56.Chimera-specific primer sequences are shown in Table 2 and SEQ IDNOS:43-52. The 5′ and 3′ universal primers anneal to the 5′ and 3′ endsof the template nucleic acid, respectively, and contain BamHI and EcoRIrestriction sites, respectively, for ease in subcloning into anexpression vector. The 5′ chimera-specific primers are antisense to theamino-terminal template and the 3′ chimera-specific primers areantisense to the carboxy-terminal template. The 5′ and 3′chimera-specific primers each contain an internal complementary sequencewhere a switch occurs from the At to Bn sequence, or alternatively, fromBn to At.

[0116] The products produced by the first round of PCR were purified,and a second round of PCR was conducted using a mixture of the productsfrom the first round of PCR as template nucleic acid. The appropriate 5′and 3′ universal primers were used to generate the chimeric nucleic acidproduct in the second round PCR. The amplified product was then digestedwith BamHI and EcoRI, ligated into pYES2 (Invitrogen, Carlsbad, Calif.)and transformed into E. coli. pYES2 is a yeast centromere-containing,episomal plasmid that is stably propagated in both E. coli and in yeast.Each nucleic acid was. inserted downstream of the GAL1 promoter inpYES2. The GAL1 promoter is induced in yeast when galactose is presentin the medium and repressed when glucose is present in the growthmedium.

[0117] Nucleic acids encoding polypeptides with site-directedalterations in the coding sequence were also prepared by overlap PCR,using 5′ and 3′ chimera-specific primers in which the internalcomplementary region contained the desired sequence modification. TABLE1 Chimera type 5′ 3′ portion portion 5′ universal primer 3′ universalprimer At Bn 5′-ggggatccatgacgtccgttaacgttaagctcc-3′5′-ccgaattcttaggaccgaccgttttggacac-3′ (SEQ ID NO: 53) (SEQ ID NO: 54) BnAt 5′-ggggatccatgacgtccattaacgtaaagctcc-35′-ccgaattcttaggaccgaccgttttggacatgagtctt-3′ (SEQ ID NO: 55) (SEQ ID NO:56)

[0118] Due to a degeneracy in the primer used to generate the nucleicacids encoding carboxy-terminal sequences from B. napus, the amino acidresidue at the fifth to last position from the carboxy-terminus in thepolypeptides designated At114, At114 L91C K92R, At114 K92R and At254 isa P and the polypeptide designated At74 is a Q at that position asindicated in FIG. 1. The polypeptides designated At173 and At399 mayhave a P or a Q at this position and are shown as Q in FIG. 1. A Q isfound in the wild-type Bn polypeptide sequence at this position. Inaddition, due to PCR infidelity in the preparation of the nucleic acidencoding At114, the amino acid residue at position 439 of SEQ ID NO:8may be an A or a T, with an A being found in the wild-type Bn sequence.In addition, PCR infidelity in the preparation of the nucleic acidencoding At114 L91C K92R resulted in the residue at position 119 beingan N. Position 119 in the wild-type Bn amino acid sequence is a D. Basedon the data presented below, this residue can be either a D or an Nwithout any apparent effect on activity.

[0119] Mutagenesis was confirmed by automated DNA sequencing, and eachconstruct was used to transform S. cerevisiae strain InvScl (Invitrogen)using a-lithium-acetate procedure (Gietz, R. and Woods, R., in MolecularGenetics of Yeast: Practical Approaches, Oxford Press, pp. 121-134(1994)).

Example 2 Fatty Acid Elongase KCS Activity in Yeast Microsomes

[0120] Elongase KCS enzymatic activity was analyzed by preparingmicrosomes from transformed yeast cells and assaying these microsomes invitro for elongase KCS activity. Transformed yeast cells were grownovernight in YPD media at 30° C. with vigorous shaking. Complete minimaluracil dropout media (cm-ura) supplemented with galactose (2%weight/volume in 40 ml) was inoculated to an OD₆₀₀ of 0.002 to 0.01.Cultures were grown at 30° C. to an OD₆₀₀ of approximately 1.5. to 2.0.Cells were harvested by centrifugation at 5000 ×g for 10 min and washedwith 10 ml ice cold isolation buffer (IB), which contains 80 mMHepes-KOH (pH 7.2), 5 mM EGTA, 5 mM EDTA, 10 mM KCl, 320 mM sucrose and2 mM DTT). Cells were then resuspended in enough IB to fill a 1.7 mltube containing 700 μl of 0.5 μm glass beads and yeast microsomes wereisolated from the cells essentially as described in Tillman, T. & Bell,R., J. Biol. Chem. 261:9144-9149 (1986). The microsomal membrane pelletwas recovered by centrifugation at 252,000 ×g for 60 min. Microsomalpellets were resuspended in a minimal volume of IB, and the proteinconcentration adjusted to 2.5 μg μl⁻¹ by addition of IB containing 15%glycerol. Microsomes were frozen on dry ice and stored at −80° C. Theprotein concentration in microsomes was determined by the Bradfordmethod (Bradford, Anal. Biochem., 72:248-54, 1976).

[0121] Elongase KCS activity was measured essentially as described inHlousek-Radojcic, et al., Plant J. 8:803-809 (1995). Briefly, thestandard elongation reaction mix contained 80 mM Hepes-KOH (pH 7.2), 20mM MgCl₂, 500 μM NADPH, 100 μM malonyl-CoA, 10 μM CoA-SH and 15 μM[¹⁴C]18:1-CoA (50 μCi μmol⁻¹). The reaction was initiated by theaddition of yeast microsomes (6 μg protein) and the mixture wasincubated at 30° C., in a final reaction volume of 25 μl. Reaction timewas 10 min unless indicated otherwise.

[0122] Methyl esters of the acyl-CoA elongase products were prepared byincubation with 500 μl 2% H₂SO₄/MeOH at 80° C. for 2 h. Extracted methylesters were separated on reverse phase silica gel TLC plates (Analtech,Newark, Del.), quantified by phosphorimaging, and analyzed by ImageQuantsoftware (Molecular Dynamics, Inc., Sunnyvale, Calif.). The detectionlimit for each product is about 0.001 nmoles/min/mg microsomal protein,depending on the phosphorimage exposure time.

Example 3 Elongase KCS Substrate Specificity

[0123] Table 3 is a summary of elongase activity and product ratios ofB. napus (Bn) and A. thaliana (At) elongase KCS nucleic acid sequencesexpressed in yeast and assayed as described in Example 2. Microsomesprepared from galactose-induced yeast expressing the indicated nucleicacid were assayed after 10 min for conversion of labeled oleoylsubstrate to eicosenoyl product, erucyl product, and lignoceryl product.For convenience, fatty acyl substrates and products are oftentimesreferred to as the acid rather than as the acyl or acyl. CoA. The ratioof 22:1 product to 20:1 product is also shown. Experiments wereperformed on 17 individual yeast transformants for each construct. TABLE3¹ 18:1(± sd) 20:1(± sd) 22:1(± sd) 20:1 + 22:1(± sd) 22:1/20:1(± sd) B.napus elongase 45 ± 4 3.3 ± 0.4 1.4 ± 0.5 4.8 ± 0.2 0.43 ± 0.11 KCS (SEQID NO: 4) A. thaliana FAE1 29 ± 9   6 ± 0.8 1.2 ± 0.2 7.1 ± 0.9 0.20 ±0.04 (SEQ ID NO: 2)

[0124] Table 4 shows the ratio of 22:1/20:1 products produced by Bn, At,and various chimeric polypeptides after incubation of the microsomeswith the labeled 18:1 substrate for 5, 10 or 20 min. The results shownin Table 4 represent 4 different microsome preparations from a singleyeast transformant with each construct and 2-3 assays of each microsomalpreparation. The At FAE1 (SEQ ID NO:2) produces about 5 times moreeicosenoic acid than erucic acid. In contrast, the Bn elongase KCS (SEQID NO:4) produces about 2-3 times more eicosenoic acid than erucic acid.See also Table 3.

[0125] The At254, At173 and At114 polypeptides have a 22:1/20:1 productratio that is similar to that of wild-type At FAE1, whereas the At74polypeptide has a product ratio that is similar to that of wild-type Bn(Table 4). These results indicate that amino acids affecting productspecificity are present between residues 75 and 114 of the wild-type Atelongase KCS. The At74 gene product possesses the amino acid sequence ofthe Bn elongase KCS of SEQ ID NO:4 at positions 75 to 114, indicatingthat amino acids of the Bn elongase KCS that differ from the at FAE1 inthis region contribute to the difference in C22:1/C20:1 product ratio.TABLE 4 Polypeptide Assayed¹ Bn At At254 At173 At114 At74 At114 L91CTime (SEQ ID (SEQ ID (SEQ ID (SEQ ID (SEQ ID (SEQ ID K92R (SEQ (min) NO:4) NO: 2) NO: 24) NO: 26) NO: 8) NO: 10) ID NO: 12) 5 0.35 ± 0.07 0.18 ±0.04 0.14 ± 0.03 0.11 ± 0.07 0.17 ± 0.04 0.42 ± 0.07 0.22 ± 0.02 10 0.33± 0.10 0.13 ± 0.01 0.11 ± 0.03 0.08 ± 0.01 0.15 ± 0.03 0.36 ± 0.06 0.20± 0.02 20 0.35 ± 0.13 0.13 ± 0.02 0.12 ± 0.03 0.11 ± 0.05 0.16 ± 0.040.29 ± 0.05 0.20 ± 0.04

[0126] Site-directed modifications were made to the At114 or At74nucleic acid sequence within the region corresponding to residues 75 to114 in order to determine which amino acids contributed to the alteredproduct ratio. The modified nucleic acids were made according to theoverlap PCR strategy described in Example 1 and the constructs wereintroduced into yeast. Elongase KCS activity was measured-as describedin Example 2. The results showed that changing the At114 amino acidsequence from alanine to serine and glutamine to lysine at positions 157and 163, respectively, resulted in undetectable elongase activity.Likewise, changing serine and isoleucine at positions 93 and 95 withinAt74 to valine in both positions also resulted in undetectable elongaseactivity.

[0127] However, when the leucine and lysine residues at positions 91 and92 within the At114 polypeptide were changed to cysteine and arginine,respectively, the C22:1/C20:1 product ratio of the resultingpolypeptide, At114 L91C K92R, was shifted to more closely resemble thatof the wild-type Bn polypeptide (Table 4).

[0128] Site-directed modifications were made to the At114 nucleic acidsequence to generate coding sequences for two new polypeptides, onebearing the leucine to cysteine modification and one bearing the lysineto arginine modification. These polypeptides were designated At114 L91Cand At114 K92R. The nucleotide sequence of the nucleic acid encodingAt114 K92R is shown in SEQ ID NO:13 and the amino acid sequence of thepolypeptide is shown in SEQ ID NO:14. The two nucleic acids wereintroduced into yeast and the activity of each polypeptide was analyzedin yeast microsome assays. The results showed that the L to C-modifiedpolypeptide, At114 L91C, had low but detectable catalytic activity. TheK to R-modified polypeptide, At114 K92R, had a higher 22:1/20:1 ratiothat approached that of wild-type Bn (Table 5). Results presented arethe mean of 1 to 3 individual assays each of at least 7 separatemicrosomal preparations. TABLE 5 20:1 + 22:1¹ (22:1/20:1) At (SEQ ID NO:2) 16.0 +/− 2.7  0.15 +/− 0.04 Bn (SEQ ID NO: 4) 9.8 +/− 3.2 0.32 +/−0.07 At114 K92R (SEQ ID 5.8 +/− 3.1 0.32 +/− 0.09 NO: 14)

Example 4 Elongase KCS Catalytic Activity

[0129] Table 6 shows the results of yeast microsome assays of Bnelongase KCS, At FAE1, and various chimeric polypeptides for variousincubation times. The data in Table 6 show the sum of C20:1 and C22:1 innmole/mg protein from microsome preparations assayed 2 to 3 times each.

[0130] The results indicate that the amount of elongase KCS activity ofthe wild-type At FAE1 is about 1.5 to 2 times higher than that ofwild-type Bh elongase KCS. The At114 polypeptide has an activity that isintermediate between the wild-type At and wild-type Bn, while the At74polypeptide has an activity that is lower than that of wild-type Bnenzymes. These results indicate that modifying amino acid residues inthe region from position 74 to 114 affects elongase activity.

[0131] The activity of the At114 L91C K92R gene product was measured inyeast microsomes and is shown in Table 6. The elongase activity of thispolypeptide was higher than that of At114. TABLE 6¹ At114 L91C Time BnAt At114 At74 K92R (min) pYES2 (SEQ ID NO: 2) (SEQ ID NO: 4) (SEQ ID NO:8) (SEQ ID NO: 10) (SEQ ID NO: 12) 0 −2.4 ± 2.4  2.7 ± 1.8 2.4 ± 1.8 1.4± 1.0  2.2 ± 0.84  2.3 ± 1.08 5 0.24 ± 0.6  5.1 ± 1.6 8.7 ± 1.2 5.9 ±0.6 3.2 ± 1.1 6.5 ± 1.0 10 0.78 ± 0.6  7.4 ± 1.8 12.1 ± 0.6  8.8 ± 0.54.1 ± 0.8 9.6 ± 1.2 20 0.96 ± 0.6  7.8 ± 2.1 13.7 ± 1.8  10.1 ± 1.2  4.4± 0.8 11.5 ± 1.1  45 1.32 ± 0.6  8.1 ± 2.2 14.0 ± 0.6  10.2 ± 1.2  4.6 ±0.5 12.1 ± 0.9 

[0132] The elongase activity of the At114 L91C and At114 K92Rpolypeptides were also assayed in yeast microsomes. The resultsindicated that the catalytic activity of the At114 L91C polypeptide wasabout 15-30% of the activity of At114, whereas the activity of At114K92R was approximately the same as that of At114.

[0133] A yeast microsome assay was carried out to compare the Bnelongase KCS shown in SEQ ID NO:4 and another naturally-occurringelongase KCS from the B. napus cultivar Askari. The elongase KCS fromAskari has the same sequence as that shown in SEQ ID NO:4, except for avaline at position 4 and an aspartic acid at position 307. The resultsindicated that the Askari elongase KCS had a higher elongase activityand a higher C22:1/C20:1 ratio that did the Bn elongase KCS of SEQ IDNO:4.

[0134] Site-directed modifications to SEQ ID NO:3 were made by thetechniques described in Example 2 to generate nucleic acids encodingpolypeptides Bn I4V, Bn G307D and Bn I4V G307D. The latter polypeptidehas the same amino acid sequence as the naturally occurring Askarielongase KCS. After cloning and transforming of each construct intoyeast as described in Example 2, microsome assays were performed. Table7 presents the results from a single experiment in which elongaseactivity and product ratios for the elongase KCS constructs weremeasured. Assays were performed as described in Example 2. The resultsindicate that changing the residue at position 4 from isoleucine tovaline had little or no effect on the elongase activity or theC22:1/C20:1 ratio. On the other hand, the Bn G307D polypeptide had ahigher elongase activity and produced more C22:1 product than did theunmodified wild-type Bn polypeptide. The amino acid sequence of Bn G307Dis shown in SEQ ID NO:34. TABLE 7¹ 18:1 20:1 22:1 24:1 22:1/20:1 20:1 +22:1 Bn 47.9 5.5 1.9 0.3 0.35 7.7 Bn I4V 48.4 5.5 2.0 0.4 0.37 7.8 BnG307D 37.2 6.7 5.4 0.7 0.80 12.7 Bn I4V G307D 41.9 6.5 4.5 0.5 0.68 11.6B. napus (Ask) 37.6 7.7 6.7 0.8 0.86 15.2

[0135] It is to be understood that while the invention has beendescribed in conjunction with the detailed description thereof, theforegoing description is intended to illustrate and not limit the scopeof the invention, which is defined by the scope of the appended claims.Other aspects, advantages, and modifications are within the scope of thefollowing claims.

1 56 1 1709 DNA Arabidopsis thaliana CDS (1)...(1518) 1 atg acg tcc gttaac gtt aag ctc ctt tac cgt tac gtc tta acc aac 48 Met Thr Ser Val AsnVal Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aac ctctgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn Leu CysLeu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg ctt accata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu Thr IleAsn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ata acagta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile Thr ValThr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atc gtaacc cga ccc aat ccg gtt tat ctc gtt 240 Gly Leu Val Leu Tyr Ile Val ThrArg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgt tac ctt ccacca ccg cat ctc aaa gtt agt gtc tct 288 Asp Tyr Ser Cys Tyr Leu Pro ProPro His Leu Lys Val Ser Val Ser 85 90 95 aaa gtc atg gat att ttc tac caaata aga aaa gct gat act tct tca 336 Lys Val Met Asp Ile Phe Tyr Gln IleArg Lys Ala Asp Thr Ser Ser 100 105 110 cgg aac gtg gca tgt gat gat ccgtcc tcg ctc gat ttc ctg agg aag 384 Arg Asn Val Ala Cys Asp Asp Pro SerSer Leu Asp Phe Leu Arg Lys 115 120 125 att caa gag cgt tca ggt cta ggtgat gag acg tac agt cct gag gga 432 Ile Gln Glu Arg Ser Gly Leu Gly AspGlu Thr Tyr Ser Pro Glu Gly 130 135 140 ctc att cac gta cca ccg cgg aagact ttt gca gcg tca cgt gaa gag 480 Leu Ile His Val Pro Pro Arg Lys ThrPhe Ala Ala Ser Arg Glu Glu 145 150 155 160 aca gag aag gtt atc atc ggtgcg ctc gaa aat cta ttc gag aac acc 528 Thr Glu Lys Val Ile Ile Gly AlaLeu Glu Asn Leu Phe Glu Asn Thr 165 170 175 aaa gtt aac cct aga gag attggt ata ctt gtg gtg aac tca agc atg 576 Lys Val Asn Pro Arg Glu Ile GlyIle Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca act cct tcg ctatcc gct atg gtc gtt aat act ttc aag 624 Phe Asn Pro Thr Pro Ser Leu SerAla Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aac atc aaa agcttt aat cta gga gga atg ggt tgt agt 672 Leu Arg Ser Asn Ile Lys Ser PheAsn Leu Gly Gly Met Gly Cys Ser 210 215 220 gct ggt gtt att gcc att gatttg gct aaa gac ttg ttg cat gtt cat 720 Ala Gly Val Ile Ala Ile Asp LeuAla Lys Asp Leu Leu His Val His 225 230 235 240 aaa aac act tat gct cttgtg gtg agc act gag aac atc aca caa ggc 768 Lys Asn Thr Tyr Ala Leu ValVal Ser Thr Glu Asn Ile Thr Gln Gly 245 250 255 att tat gct gga gaa aataga tca atg atg gtt agc aat tgc ttg ttt 816 Ile Tyr Ala Gly Glu Asn ArgSer Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggg gcc gcgatt ttg ctc tct aac aag tcg gga gac cgg 864 Arg Val Gly Gly Ala Ala IleLeu Leu Ser Asn Lys Ser Gly Asp Arg 275 280 285 aga cgg tcc aag tac aagcta gtt cac acg gtc cga acg cat act gga 912 Arg Arg Ser Lys Tyr Lys LeuVal His Thr Val Arg Thr His Thr Gly 290 295 300 gct gat gac aag tct tttcga tgt gtg caa caa gaa gac gat gag agc 960 Ala Asp Asp Lys Ser Phe ArgCys Val Gln Gln Glu Asp Asp Glu Ser 305 310 315 320 ggc aaa atc gga gtttgt ctg tca aag gac ata acc aat gtt gcg ggg 1008 Gly Lys Ile Gly Val CysLeu Ser Lys Asp Ile Thr Asn Val Ala Gly 325 330 335 aca aca ctt acg aaaaat ata gca aca ttg ggt ccg ttg att ctt cct 1056 Thr Thr Leu Thr Lys AsnIle Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agc gaa aag tttctt ttt ttc gct acc ttc gtc gcc aag aaa ctt 1104 Leu Ser Glu Lys Phe LeuPhe Phe Ala Thr Phe Val Ala Lys Lys Leu 355 360 365 cta aag gat aaa atcaag cat tac tat gtt ccg gat ttc aag ctt gct 1152 Leu Lys Asp Lys Ile LysHis Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 gtt gac cat ttc tgtatt cat gcc gga ggc aga gcc gtg atc gat gag 1200 Val Asp His Phe Cys IleHis Ala Gly Gly Arg Ala Val Ile Asp Glu 385 390 395 400 cta gag aag aactta gga cta tcg ccg atc gat gtg gag gca tct aga 1248 Leu Glu Lys Asn LeuGly Leu Ser Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tca acg tta cataga ttt ggg aat act tca tct agc tca att tgg tat 1296 Ser Thr Leu His ArgPhe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gaa tta gca tacata gag gca aag gga aga atg aag aaa ggg aat aaa 1344 Glu Leu Ala Tyr IleGlu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gct tgg cag attgct tta gga tca ggg ttt aag tgt aat agt gcg gtt 1392 Ala Trp Gln Ile AlaLeu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtg gct ctacgc aat gtc aag gca tcg gca aat agt cct tgg caa 1440 Trp Val Ala Leu ArgAsn Val Lys Ala Ser Ala Asn Ser Pro Trp Gln 465 470 475 480 cat tgc atcgat aga tat ccg gtt aaa att gat tct gat ttg tca aag 1488 His Cys Ile AspArg Tyr Pro Val Lys Ile Asp Ser Asp Leu Ser Lys 485 490 495 tca aag actcat gtc caa aac ggt cgg tcc taatttgatg tatctgagtg 1538 Ser Lys Thr HisVal Gln Asn Gly Arg Ser 500 505 ccaacgttta ctttgtcttt cctttcttttattggttatg aattagatgt ttactaatgt 1598 tcctctcttt ttcgttataa ataaagaagttcaattcttc ctatagtttc aaacgcgatt 1658 ttaagcgttt ctatttaggt ttacatgaatttcttttaca aaccatcttt t 1709 2 506 PRT Arabidopsis thaliana 2 Met ThrSer Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 PhePhe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 AlaSer Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 GlnHis Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 GlyLeu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Lys Val Ser Val Ser 85 90 95Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105110 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr Tyr Ser Pro Glu Gly130 135 140 Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala Ala Ser Arg GluGlu 145 150 155 160 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu Asn Leu PheGlu Asn Thr 165 170 175 Lys Val Asn Pro Arg Glu Ile Gly Ile Leu Val ValAsn Ser Ser Met 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met ValVal Asn Thr Phe Lys 195 200 205 Leu Arg Ser Asn Ile Lys Ser Phe Asn LeuGly Gly Met Gly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu AlaLys Asp Leu Leu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu ValVal Ser Thr Glu Asn Ile Thr Gln Gly 245 250 255 Ile Tyr Ala Gly Glu AsnArg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly AlaAla Ile Leu Leu Ser Asn Lys Ser Gly Asp Arg 275 280 285 Arg Arg Ser LysTyr Lys Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp AspLys Ser Phe Arg Cys Val Gln Gln Glu Asp Asp Glu Ser 305 310 315 320 GlyLys Ile Gly Val Cys Leu Ser Lys Asp Ile Thr Asn Val Ala Gly 325 330 335Thr Thr Leu Thr Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345350 Leu Ser Glu Lys Phe Leu Phe Phe Ala Thr Phe Val Ala Lys Lys Leu 355360 365 Leu Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala370 375 380 Val Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile AspGlu 385 390 395 400 Leu Glu Lys Asn Leu Gly Leu Ser Pro Ile Asp Val GluAla Ser Arg 405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser SerSer Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg MetLys Lys Gly Asn Lys 435 440 445 Ala Trp Gln Ile Ala Leu Gly Ser Gly PheLys Cys Asn Ser Ala Val 450 455 460 Trp Val Ala Leu Arg Asn Val Lys AlaSer Ala Asn Ser Pro Trp Gln 465 470 475 480 His Cys Ile Asp Arg Tyr ProVal Lys Ile Asp Ser Asp Leu Ser Lys 485 490 495 Ser Lys Thr His Val GlnAsn Gly Arg Ser 500 505 3 1524 DNA Brassica napus CDS (1)...(1521) 3 atgacg tcc att aac gta aag ctc ctt tac cat tac gtc ata acc aac 48 Met ThrSer Ile Asn Val Lys Leu Leu Tyr His Tyr Val Ile Thr Asn 1 5 10 15 cttttc aac ctt tgc ttc ttt ccg tta acg gcg atc gtc gcc gga aaa 96 Leu PheAsn Leu Cys Phe Phe Pro Leu Thr Ala Ile Val Ala Gly Lys 20 25 30 gcc tatcgg ctt acc ata gac gat ctt cac cac tta tac tat tcc tat 144 Ala Tyr ArgLeu Thr Ile Asp Asp Leu His His Leu Tyr Tyr Ser Tyr 35 40 45 ctc caa cacaac ctc ata acc atc gct cca ctc ttt gcc ttc acc gtt 192 Leu Gln His AsnLeu Ile Thr Ile Ala Pro Leu Phe Ala Phe Thr Val 50 55 60 ttc ggt tcg gttctc tac atc gca acc cgg ccc aaa ccg gtt tac ctc 240 Phe Gly Ser Val LeuTyr Ile Ala Thr Arg Pro Lys Pro Val Tyr Leu 65 70 75 80 gtt gag tac tcatgc tac ctt cca cca acg cat tgt aga tca agt atc 288 Val Glu Tyr Ser CysTyr Leu Pro Pro Thr His Cys Arg Ser Ser Ile 85 90 95 tcc aag gtc atg gatatc ttt tat caa gta aga aaa gct gat cct tct 336 Ser Lys Val Met Asp IlePhe Tyr Gln Val Arg Lys Ala Asp Pro Ser 100 105 110 cgg aac ggc acg tgcgat gac tcg tcg tgg ctt gac ttc ttg agg aag 384 Arg Asn Gly Thr Cys AspAsp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 att caa gaa cgt tcaggt cta ggc gat gaa act cac ggg ccc gag ggg 432 Ile Gln Glu Arg Ser GlyLeu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135 140 ctg ctt cag gtc cctccc cgg aag act ttt gcg gcg gcg cgt gaa gag 480 Leu Leu Gln Val Pro ProArg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 acg gag caa gttatc att ggt gcg cta gaa aat cta ttc aag aac acc 528 Thr Glu Gln Val IleIle Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aac cctaaa gat ata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn Pro LysAsp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca actcca tcg ctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aacgta aga agc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser Asn ValArg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gtt atagcc att gat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val Ile AlaIle Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aat acgtat gct ctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn Thr TyrAla Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tac gctggt gat aat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala GlyAsp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggtggg gcc gct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val Gly GlyAla Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cgg tccaag tac gag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg Ser LysTyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gac ggcaag tct ttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp Gly LysSer Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaaatc gga gtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly Lys IleGly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cga acggtt aag aaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr ValLys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agcgag aaa ctt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser GluLys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaagat aaa atc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys AspLys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 att gaccat ttt tgt ata cat gcc gga ggc aga gcc gtg att gat gtg 1200 Ile Asp HisPhe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 ctagag aag aac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 Leu GluLys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tcaacg tta cat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 Ser ThrLeu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gagttg gca tac ata gaa gca aaa gga agg atg aag aaa ggt aat aaa 1344 Glu LeuAla Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtttgg cag att gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 Val TrpGln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgggtg gct cta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 Trp ValAla Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480cac tgc atc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495tca gag act cgt gtc caa aac ggt cgg tcc taa taa 1524 Ser Glu Thr Arg ValGln Asn Gly Arg Ser * 500 505 4 506 PRT Brassica napus 4 Met Thr Ser IleAsn Val Lys Leu Leu Tyr His Tyr Val Ile Thr Asn 1 5 10 15 Leu Phe AsnLeu Cys Phe Phe Pro Leu Thr Ala Ile Val Ala Gly Lys 20 25 30 Ala Tyr ArgLeu Thr Ile Asp Asp Leu His His Leu Tyr Tyr Ser Tyr 35 40 45 Leu Gln HisAsn Leu Ile Thr Ile Ala Pro Leu Phe Ala Phe Thr Val 50 55 60 Phe Gly SerVal Leu Tyr Ile Ala Thr Arg Pro Lys Pro Val Tyr Leu 65 70 75 80 Val GluTyr Ser Cys Tyr Leu Pro Pro Thr His Cys Arg Ser Ser Ile 85 90 95 Ser LysVal Met Asp Ile Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser 100 105 110 ArgAsn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135140 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145150 155 160 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys AsnThr 165 170 175 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn SerSer Met 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val AsnThr Phe Lys 195 200 205 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly GlyMet Gly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys AspLeu Leu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu Val Val SerThr Glu Asn Ile Thr Tyr Asn 245 250 255 Ile Tyr Ala Gly Asp Asn Arg SerMet Met Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly Ala Ala IleLeu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 Arg Arg Ser Lys Tyr GluLeu Val His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp Gly Lys SerPhe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 Gly Lys IleGly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 Arg ThrVal Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 LeuSer Glu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375380 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385390 395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala SerArg 405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser IleTrp Tyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys LysGly Asn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys CysAsn Ser Ala Val 450 455 460 Trp Val Ala Leu Asn Asn Val Lys Ala Ser ThrAsn Ser Pro Trp Glu 465 470 475 480 His Cys Ile Asp Arg Tyr Pro Val LysIle Asp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr Arg Val Gln Asn GlyArg Ser 500 505 5 1736 DNA Brassica napus CDS (85)...(1599) 5 tagagcgtaacggaccacaa aagaggatcc atacaaatac atctcatcgc ttccattact 60 attctccgacacacacactg agca atg acg tcc att aac gta aag ctc ctt 111 Met Thr Ser IleAsn Val Lys Leu Leu 1 5 tac cat tac gtc ata acc aac ctt ttc aac ctt tgtttc ttt cca tta 159 Tyr His Tyr Val Ile Thr Asn Leu Phe Asn Leu Cys PhePhe Pro Leu 10 15 20 25 acg gcg atc gtc gcc gga aaa gcc tat ctt acc atagac gat ctt cac 207 Thr Ala Ile Val Ala Gly Lys Ala Tyr Leu Thr Ile AspAsp Leu His 30 35 40 cac tta tac tat tcc tat ctc caa cac aac ctc ata accatt gct cca 255 His Leu Tyr Tyr Ser Tyr Leu Gln His Asn Leu Ile Thr IleAla Pro 45 50 55 ctc ttg gcc ttc acc gtt ttc ggt tcg gtt ctc tac atc gcaacc cgg 303 Leu Leu Ala Phe Thr Val Phe Gly Ser Val Leu Tyr Ile Ala ThrArg 60 65 70 ccc aaa ccg gtt tac ctc gtg gag tac tca tgc tac ctt cca ccaacg 351 Pro Lys Pro Val Tyr Leu Val Glu Tyr Ser Cys Tyr Leu Pro Pro Thr75 80 85 cat tgt aga tca agt atc tcc aag gtc atg gat atc ttt ttc caa gta399 His Cys Arg Ser Ser Ile Ser Lys Val Met Asp Ile Phe Phe Gln Val 9095 100 105 aga aaa gct gat cct tct cgg aac ggc acg tgc gat gac tcg tcctgg 447 Arg Lys Ala Asp Pro Ser Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp110 115 120 ctt gac ttc ttg agg aag att caa gaa cgt tca ggt cta ggc gatgaa 495 Leu Asp Phe Leu Arg Lys Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu125 130 135 acc cac ggg ccc gag ggg ctg ctt cag gtc cct ccc cgg aag actttt 543 Thr His Gly Pro Glu Gly Leu Leu Gln Val Pro Pro Arg Lys Thr Phe140 145 150 gcg cgc gcg cgt gaa gag acg gag caa gtt atc att ggt gcg ctagaa 591 Ala Arg Ala Arg Glu Glu Thr Glu Gln Val Ile Ile Gly Ala Leu Glu155 160 165 aat cta ttc aag aac acc aat gtt aac cct aaa gat ata ggt atactt 639 Asn Leu Phe Lys Asn Thr Asn Val Asn Pro Lys Asp Ile Gly Ile Leu170 175 180 185 gtg gtg aac tca agc atg ttt aat cca act cct tcg ctc tccgcg atg 687 Val Val Asn Ser Ser Met Phe Asn Pro Thr Pro Ser Leu Ser AlaMet 190 195 200 gtc gtt aac act ttc aag ctc cga agc aac gta aga agc tttaac ctt 735 Val Val Asn Thr Phe Lys Leu Arg Ser Asn Val Arg Ser Phe AsnLeu 205 210 215 ggt ggc atg ggt tgt agt gcc ggc gtt ata gcc att gat ctagca aag 783 Gly Gly Met Gly Cys Ser Ala Gly Val Ile Ala Ile Asp Leu AlaLys 220 225 230 gac ttg ttg cat gtc cat aaa aat acg tat gct ctt gtg gtgagc aca 831 Asp Leu Leu His Val His Lys Asn Thr Tyr Ala Leu Val Val SerThr 235 240 245 gag aac atc act tat aac att tac gct ggt gat aat agg tccatg atg 879 Glu Asn Ile Thr Tyr Asn Ile Tyr Ala Gly Asp Asn Arg Ser MetMet 250 255 260 265 gtt tca aat tgc ttg ttc cgt gtt ggt ggg gcc gct attttg ctc tcc 927 Val Ser Asn Cys Leu Phe Arg Val Gly Gly Ala Ala Ile LeuLeu Ser 270 275 280 aac aag cct aga gat cgt aga cgg tcc aag tac gag ctagtt cac acg 975 Asn Lys Pro Arg Asp Arg Arg Arg Ser Lys Tyr Glu Leu ValHis Thr 285 290 295 gtt cga acg cat acc gga gct gac gac aag tct ttt cgttgc gtg caa 1023 Val Arg Thr His Thr Gly Ala Asp Asp Lys Ser Phe Arg CysVal Gln 300 305 310 caa gga gac gat gag aac ggc caa acc gga gtg agt ttgtcc aag gac 1071 Gln Gly Asp Asp Glu Asn Gly Gln Thr Gly Val Ser Leu SerLys Asp 315 320 325 ata acc gat gtt gct ggt cga acg gtt aag aaa aac atagca acg ctg 1119 Ile Thr Asp Val Ala Gly Arg Thr Val Lys Lys Asn Ile AlaThr Leu 330 335 340 345 ggt ccg ttg att ctt ccg tta agc gag aaa ctt cttttt ttc gtt acc 1167 Gly Pro Leu Ile Leu Pro Leu Ser Glu Lys Leu Leu PhePhe Val Thr 350 355 360 ttc atg ggc aag aaa ctt ttc aaa gac gaa atc aaacat tat tac gtc 1215 Phe Met Gly Lys Lys Leu Phe Lys Asp Glu Ile Lys HisTyr Tyr Val 365 370 375 ccg gac ttc aag ctt gct atc gac cat ttt tgt atacat gcc gga ggc 1263 Pro Asp Phe Lys Leu Ala Ile Asp His Phe Cys Ile HisAla Gly Gly 380 385 390 aaa gcc gtg att gat gtg cta gag aag aac cta ggccta gca ccg atc 1311 Lys Ala Val Ile Asp Val Leu Glu Lys Asn Leu Gly LeuAla Pro Ile 395 400 405 gat gta gag gca tca aga tca acg tta cat aga tttgga aac act tca 1359 Asp Val Glu Ala Ser Arg Ser Thr Leu His Arg Phe GlyAsn Thr Ser 410 415 420 425 tct agc tca ata tgg tat gag ttg gca tac atagaa ccc aaa gga agg 1407 Ser Ser Ser Ile Trp Tyr Glu Leu Ala Tyr Ile GluPro Lys Gly Arg 430 435 440 atg aag aaa ggt aat aaa gtt tgg cag att gcttta ggg tca ggc ttt 1455 Met Lys Lys Gly Asn Lys Val Trp Gln Ile Ala LeuGly Ser Gly Phe 445 450 455 aag tgt aac agt gca gtt tgg gtg gct cta aacaat gtc aaa gct tca 1503 Lys Cys Asn Ser Ala Val Trp Val Ala Leu Asn AsnVal Lys Ala Ser 460 465 470 aca aat agt cct tgg gaa cac tgc atc gac agatac ccg gtt aaa att 1551 Thr Asn Ser Pro Trp Glu His Cys Ile Asp Arg TyrPro Val Lys Ile 475 480 485 gat tct gat tca ggt aag tca gag act cgt gtccca aac ggt cgg tcc 1599 Asp Ser Asp Ser Gly Lys Ser Glu Thr Arg Val ProAsn Gly Arg Ser 490 495 500 505 taataaatga tgtttgctct ctttcgtttctttttattgg ttataataat ttgatggcca 1659 cgatgtttct cttgtttgtt atgaataaagaatcccacgg tgttctagta aaaaaaaaaa 1719 aaaaaaaaaa aaaaaaa 1736 6 505 PRTBrassica napus 6 Met Thr Ser Ile Asn Val Lys Leu Leu Tyr His Tyr Val IleThr Asn 1 5 10 15 Leu Phe Asn Leu Cys Phe Phe Pro Leu Thr Ala Ile ValAla Gly Lys 20 25 30 Ala Tyr Leu Thr Ile Asp Asp Leu His His Leu Tyr TyrSer Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Ile Ala Pro Leu Leu Ala PheThr Val Phe 50 55 60 Gly Ser Val Leu Tyr Ile Ala Thr Arg Pro Lys Pro ValTyr Leu Val 65 70 75 80 Glu Tyr Ser Cys Tyr Leu Pro Pro Thr His Cys ArgSer Ser Ile Ser 85 90 95 Lys Val Met Asp Ile Phe Phe Gln Val Arg Lys AlaAsp Pro Ser Arg 100 105 110 Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu AspPhe Leu Arg Lys Ile 115 120 125 Gln Glu Arg Ser Gly Leu Gly Asp Glu ThrHis Gly Pro Glu Gly Leu 130 135 140 Leu Gln Val Pro Pro Arg Lys Thr PheAla Arg Ala Arg Glu Glu Thr 145 150 155 160 Glu Gln Val Ile Ile Gly AlaLeu Glu Asn Leu Phe Lys Asn Thr Asn 165 170 175 Val Asn Pro Lys Asp IleGly Ile Leu Val Val Asn Ser Ser Met Phe 180 185 190 Asn Pro Thr Pro SerLeu Ser Ala Met Val Val Asn Thr Phe Lys Leu 195 200 205 Arg Ser Asn ValArg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser Ala 210 215 220 Gly Val IleAla Ile Asp Leu Ala Lys Asp Leu Leu His Val His Lys 225 230 235 240 AsnThr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn Ile 245 250 255Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe Arg 260 265270 Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Arg Asp Arg Arg 275280 285 Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His Thr Gly Ala290 295 300 Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp Glu AsnGly 305 310 315 320 Gln Thr Gly Val Ser Leu Ser Lys Asp Ile Thr Asp ValAla Gly Arg 325 330 335 Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro LeuIle Leu Pro Leu 340 345 350 Ser Glu Lys Leu Leu Phe Phe Val Thr Phe MetGly Lys Lys Leu Phe 355 360 365 Lys Asp Glu Ile Lys His Tyr Tyr Val ProAsp Phe Lys Leu Ala Ile 370 375 380 Asp His Phe Cys Ile His Ala Gly GlyLys Ala Val Ile Asp Val Leu 385 390 395 400 Glu Lys Asn Leu Gly Leu AlaPro Ile Asp Val Glu Ala Ser Arg Ser 405 410 415 Thr Leu His Arg Phe GlyAsn Thr Ser Ser Ser Ser Ile Trp Tyr Glu 420 425 430 Leu Ala Tyr Ile GluPro Lys Gly Arg Met Lys Lys Gly Asn Lys Val 435 440 445 Trp Gln Ile AlaLeu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val Trp 450 455 460 Val Ala LeuAsn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu His 465 470 475 480 CysIle Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys Ser 485 490 495Glu Thr Arg Val Pro Asn Gly Arg Ser 500 505 7 1521 DNA ArtificialSequence 5′ 342 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′ 1179 bpfrom B. napus elongase KCS (SEQ ID NO3); designated At114 7 atg acg tccgtt aac gtt aag ctc ctt tac cgt tat gtc tta acc aac 48 Met Thr Ser ValAsn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aacctc tgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg cttacc ata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu ThrIle Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ataaca gta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile ThrVal Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atcgta acc cga ccc aat ccg gtt tat ctc gtt 240 Gly Leu Val Leu Tyr Ile ValThr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgt tac cttccg cca ccg cat ctc aaa gtt agt gtc tct 288 Asp Tyr Ser Cys Tyr Leu ProPro Pro His Leu Lys Val Ser Val Ser 85 90 95 aaa gtc atg gat att ttc taccaa ata aga aaa gct gat act tct tca 336 Lys Val Met Asp Ile Phe Tyr GlnIle Arg Lys Ala Asp Thr Ser Ser 100 105 110 cgg aac ggc acg tgt gat gattcg tcg tgg ctt gac ttc ttg agg aag 384 Arg Asn Gly Thr Cys Asp Asp SerSer Trp Leu Asp Phe Leu Arg Lys 115 120 125 att caa gaa cgt tca ggt ctaggc gat gaa act cac ggg ccc gag ggg 432 Ile Gln Glu Arg Ser Gly Leu GlyAsp Glu Thr His Gly Pro Glu Gly 130 135 140 ctg ctt cag gtc cct ccc cggaag act ttt gcg gcg gcg cgt gaa gag 480 Leu Leu Gln Val Pro Pro Arg LysThr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 acg gag caa gtt atc attggt gcg cta gaa aat cta ttc aag aac acc 528 Thr Glu Gln Val Ile Ile GlyAla Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aac cct aaa gatata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn Pro Lys Asp IleGly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca act cca tcgctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro Thr Pro Ser LeuSer Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aac gta agaagc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser Asn Val Arg SerPhe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gtt ata gcc attgat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val Ile Ala Ile AspLeu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aat acg tat gctctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn Thr Tyr Ala LeuVal Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tac gct ggt gataat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala Gly Asp AsnArg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggg gccgct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val Gly Gly Ala AlaIle Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cgg tcc aag tacgag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg Ser Lys Tyr GluLeu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gac ggc aag tctttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp Gly Lys Ser PheArg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaa atc ggagtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly Lys Ile Gly ValSer Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cga acg gtt aagaaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr Val Lys LysAsn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agc gag aaactt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser Glu Lys LeuLeu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaa gat aaaatc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys Asp Lys IleLys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 att gac cat ttttgt ata cat gcc gga ggc aga gcc gtg att gat gtg 1200 Ile Asp His Phe CysIle His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 cta gag aagaac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 Leu Glu Lys AsnLeu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tca acg ttacat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 Ser Thr Leu HisArg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gag ttg gcatac ata gaa rca aaa gga agg atg aag aaa ggt aat aaa 1344 Glu Leu Ala TyrIle Glu Xaa Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtt tgg cagatt gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 Val Trp Gln IleAla Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtg gctcta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 Trp Val Ala LeuAsn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 cac tgcatc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488 His Cys IleAsp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495 tca gagact cgt gtc cca aac ggt cgg tcc taa 1521 Ser Glu Thr Arg Val Pro Asn GlyArg Ser 500 505 8 506 PRT Artificial Sequence VARIANT (0)...(0) Xaa =Ala or Thr 8 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu ThrAsn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu AlaGly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu SerTyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe ThrVal Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val TyrLeu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Lys ValSer Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala AspThr Ser Ser 100 105 110 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu AspPhe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu ThrHis Gly Pro Glu Gly 130 135 140 Leu Leu Gln Val Pro Pro Arg Lys Thr PheAla Ala Ala Arg Glu Glu 145 150 155 160 Thr Glu Gln Val Ile Ile Gly AlaLeu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Asn Val Asn Pro Lys Asp IleGly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro Thr Pro SerLeu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg Ser Asn ValArg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala Gly Val IleAla Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 Lys AsnThr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 IleTyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290295 300 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr Asp ValAla Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro LeuIle Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe MetGly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val ProAsp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys Ile His Ala Gly GlyArg Ala Val Ile Asp Val 385 390 395 400 Leu Glu Lys Asn Leu Ala Leu AlaPro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His Arg Phe GlyAsn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr Ile GluXaa Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Val Trp Gln Ile AlaLeu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp Val Ala LeuAsn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 His CysIle Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495 SerGlu Thr Arg Val Pro Asn Gly Arg Ser 500 505 9 1518 DNA ArtificialSequence 5′ 222 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′ 1296 bpfrom B. napus elongase KCS (SEQ ID NO3); designated At74 9 atg acg tccgtt aac gtt aag ctc ctt tac cgt tac gtc tta acc aac 48 Met Thr Ser ValAsn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aacctc tgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg cttacc ata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu ThrIle Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ataaca gta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile ThrVal Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atcgta acc cga ccc aaa ccg gtt tac ctc gtt 240 Gly Leu Val Leu Tyr Ile ValThr Arg Pro Lys Pro Val Tyr Leu Val 65 70 75 80 gag tac tca tgc tac cttcca cca acg cat tgt aga tca agt atc tcc 288 Glu Tyr Ser Cys Tyr Leu ProPro Thr His Cys Arg Ser Ser Ile Ser 85 90 95 aag gtc atg gat atc ttt tatcaa gta aga aaa gct gat cct tct cgg 336 Lys Val Met Asp Ile Phe Tyr GlnVal Arg Lys Ala Asp Pro Ser Arg 100 105 110 aac ggc acg tgc gat gac tcgtcg tgg ctt gac ttc ttg agg aag att 384 Asn Gly Thr Cys Asp Asp Ser SerTrp Leu Asp Phe Leu Arg Lys Ile 115 120 125 caa gaa cgt tca ggt cta ggcgat gaa act cac ggg ccc gag ggg ctg 432 Gln Glu Arg Ser Gly Leu Gly AspGlu Thr His Gly Pro Glu Gly Leu 130 135 140 ctt cag gtc cct ccc cgg aagact ttt gcg gcg gcg cgt gaa gag acg 480 Leu Gln Val Pro Pro Arg Lys ThrPhe Ala Ala Ala Arg Glu Glu Thr 145 150 155 160 gag caa gtt atc att ggtgcg cta gaa aat cta ttc aag aac acc aac 528 Glu Gln Val Ile Ile Gly AlaLeu Glu Asn Leu Phe Lys Asn Thr Asn 165 170 175 gtt aac cct aaa gat ataggt ata ctt gtg gtg aac tca agc atg ttt 576 Val Asn Pro Lys Asp Ile GlyIle Leu Val Val Asn Ser Ser Met Phe 180 185 190 aat cca act cca tcg ctctcc gcg atg gtc gtt aac act ttc aag ctc 624 Asn Pro Thr Pro Ser Leu SerAla Met Val Val Asn Thr Phe Lys Leu 195 200 205 cga agc aac gta aga agcttt aac ctt ggt ggc atg ggt tgt agt gcc 672 Arg Ser Asn Val Arg Ser PheAsn Leu Gly Gly Met Gly Cys Ser Ala 210 215 220 ggc gtt ata gcc att gatcta gca aag gac ttg ttg cat gtc cat aaa 720 Gly Val Ile Ala Ile Asp LeuAla Lys Asp Leu Leu His Val His Lys 225 230 235 240 aat acg tat gct cttgtg gtg agc aca gag aac atc act tat aac att 768 Asn Thr Tyr Ala Leu ValVal Ser Thr Glu Asn Ile Thr Tyr Asn Ile 245 250 255 tac gct ggt gat aatagg tcc atg atg gtt tca aat tgc ttg ttc cgt 816 Tyr Ala Gly Asp Asn ArgSer Met Met Val Ser Asn Cys Leu Phe Arg 260 265 270 gtt ggt ggg gcc gctatt ttg ctc tcc aac aag cct gga gat cgt aga 864 Val Gly Gly Ala Ala IleLeu Leu Ser Asn Lys Pro Gly Asp Arg Arg 275 280 285 cgg tcc aag tac gagcta gtt cac acg gtt cga acg cat acc gga gct 912 Arg Ser Lys Tyr Glu LeuVal His Thr Val Arg Thr His Thr Gly Ala 290 295 300 gac ggc aag tct tttcgt tgc gtg caa caa gga gac gat gag aac ggc 960 Asp Gly Lys Ser Phe ArgCys Val Gln Gln Gly Asp Asp Glu Asn Gly 305 310 315 320 aaa atc gga gtgagt ttg tcc aag gac ata acc gat gtt gct ggt cga 1008 Lys Ile Gly Val SerLeu Ser Lys Asp Ile Thr Asp Val Ala Gly Arg 325 330 335 acg gtt aag aaaaac ata gca acg ttg ggt ccg ttg att ctt ccg tta 1056 Thr Val Lys Lys AsnIle Ala Thr Leu Gly Pro Leu Ile Leu Pro Leu 340 345 350 agc gag aaa cttctt ttt ttc gtt acc ttc atg ggc aag aaa ctt ttc 1104 Ser Glu Lys Leu LeuPhe Phe Val Thr Phe Met Gly Lys Lys Leu Phe 355 360 365 aaa gat aaa atcaaa cat tac tac gtc ccg gat ttc aaa ctt gct att 1152 Lys Asp Lys Ile LysHis Tyr Tyr Val Pro Asp Phe Lys Leu Ala Ile 370 375 380 gac cat ttt tgtata cat gcc gga ggc aga gcc gtg att gat gtg cta 1200 Asp His Phe Cys IleHis Ala Gly Gly Arg Ala Val Ile Asp Val Leu 385 390 395 400 gag aag aaccta gcc cta gca ccg atc gat gta gag gca tca aga tca 1248 Glu Lys Asn LeuAla Leu Ala Pro Ile Asp Val Glu Ala Ser Arg Ser 405 410 415 acg tta cataga ttt gga aac act tca tct agc tca ata tgg tat gag 1296 Thr Leu His ArgPhe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr Glu 420 425 430 ttg gca tacata gaa gca aaa gga agg atg aag aaa ggt aat aaa gtt 1344 Leu Ala Tyr IleGlu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys Val 435 440 445 tgg cag attgct tta ggg tca ggc ttt aag tgt aac agt gca gtt tgg 1392 Trp Gln Ile AlaLeu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val Trp 450 455 460 gtg gct ctaaac aat gtc aaa gct tcg aca aat agt cct tgg gaa cac 1440 Val Ala Leu AsnAsn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu His 465 470 475 480 tgc atcgac aga tac ccg gtc aaa att gat tct gat tca ggt aag tca 1488 Cys Ile AspArg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys Ser 485 490 495 gag actcgt gtc caa aac ggt cgg tcc taa 1518 Glu Thr Arg Val Gln Asn Gly Arg Ser500 505 10 505 PRT Artificial Sequence 5′ 74 amino acids from A.thaliana FAE1 (SEQ ID NO2) and 3′ 431 amino acids from B. napus elongaseKCS (SEQ ID NO4); designated At74 10 Met Thr Ser Val Asn Val Lys Leu LeuTyr Arg Tyr Val Leu Thr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe ProLeu Thr Ala Phe Leu Ala Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn AspLeu His Asn Phe Leu Ser Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val ThrLeu Leu Phe Ala Phe Thr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val ThrArg Pro Lys Pro Val Tyr Leu Val 65 70 75 80 Glu Tyr Ser Cys Tyr Leu ProPro Thr His Cys Arg Ser Ser Ile Ser 85 90 95 Lys Val Met Asp Ile Phe TyrGln Val Arg Lys Ala Asp Pro Ser Arg 100 105 110 Asn Gly Thr Cys Asp AspSer Ser Trp Leu Asp Phe Leu Arg Lys Ile 115 120 125 Gln Glu Arg Ser GlyLeu Gly Asp Glu Thr His Gly Pro Glu Gly Leu 130 135 140 Leu Gln Val ProPro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu Thr 145 150 155 160 Glu GlnVal Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr Asn 165 170 175 ValAsn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser Ser Met Phe 180 185 190Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys Leu 195 200205 Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser Ala 210215 220 Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His Lys225 230 235 240 Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr TyrAsn Ile 245 250 255 Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn CysLeu Phe Arg 260 265 270 Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys ProGly Asp Arg Arg 275 280 285 Arg Ser Lys Tyr Glu Leu Val His Thr Val ArgThr His Thr Gly Ala 290 295 300 Asp Gly Lys Ser Phe Arg Cys Val Gln GlnGly Asp Asp Glu Asn Gly 305 310 315 320 Lys Ile Gly Val Ser Leu Ser LysAsp Ile Thr Asp Val Ala Gly Arg 325 330 335 Thr Val Lys Lys Asn Ile AlaThr Leu Gly Pro Leu Ile Leu Pro Leu 340 345 350 Ser Glu Lys Leu Leu PhePhe Val Thr Phe Met Gly Lys Lys Leu Phe 355 360 365 Lys Asp Lys Ile LysHis Tyr Tyr Val Pro Asp Phe Lys Leu Ala Ile 370 375 380 Asp His Phe CysIle His Ala Gly Gly Arg Ala Val Ile Asp Val Leu 385 390 395 400 Glu LysAsn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg Ser 405 410 415 ThrLeu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr Glu 420 425 430Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys Val 435 440445 Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val Trp 450455 460 Val Ala Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu His465 470 475 480 Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser GlyLys Ser 485 490 495 Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 11 1521DNA Artificial Sequence 5′ 342 bp from A. thaliana FAE1 (SEQ ID NO1) and3′ 1179 bp from B. napus elongase KCS (SEQ ID NO3) having mutations atpositions 271, 272 and 275; designated At114 L91C K92R 11 atg acg tccgtt aac gtt aag ctc ctt tac cgt tat gtc tta acc aac 48 Met Thr Ser ValAsn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aacctc tgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg cttacc ata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu ThrIle Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ataaca gta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile ThrVal Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atcgta acc cga ccc aat ccg gtt tat ctc gtt 240 Gly Leu Val Leu Tyr Ile ValThr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgt tac cttccg cca ccg cat tgc aga gtt agt gtc tct 288 Asp Tyr Ser Cys Tyr Leu ProPro Pro His Cys Arg Val Ser Val Ser 85 90 95 aaa gtc atg gat att ttc taccaa ata aga aaa gct gat act tct tca 336 Lys Val Met Asp Ile Phe Tyr GlnIle Arg Lys Ala Asp Thr Ser Ser 100 105 110 cgg aac ggc acg tgt gat aattcg tcg tgg ctt gac ttc ttg agg aag 384 Arg Asn Gly Thr Cys Asp Asn SerSer Trp Leu Asp Phe Leu Arg Lys 115 120 125 att caa gaa cgt tca ggt ctaggc gat gaa act cac ggg ccc gag ggg 432 Ile Gln Glu Arg Ser Gly Leu GlyAsp Glu Thr His Gly Pro Glu Gly 130 135 140 ctg ctt cag gtc cct ccc cggaag act ttt gcg gcg gcg cgt gaa gag 480 Leu Leu Gln Val Pro Pro Arg LysThr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 acg gag caa gtt atc attggt gcg cta gaa aat cta ttc aag aac acc 528 Thr Glu Gln Val Ile Ile GlyAla Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aac cct aaa gatata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn Pro Lys Asp IleGly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca act cca tcgctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro Thr Pro Ser LeuSer Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aac gta agaagc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser Asn Val Arg SerPhe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gtt ata gcc attgat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val Ile Ala Ile AspLeu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aat acg tat gctctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn Thr Tyr Ala LeuVal Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tac gct ggt gataat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala Gly Asp AsnArg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggg gccgct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val Gly Gly Ala AlaIle Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cgg tcc aag tacgag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg Ser Lys Tyr GluLeu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gac ggc aag tctttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp Gly Lys Ser PheArg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaa atc ggagtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly Lys Ile Gly ValSer Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cga acg gtt aagaaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr Val Lys LysAsn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agc gag aaactt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser Glu Lys LeuLeu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaa gat aaaatc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys Asp Lys IleLys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 att gac cat ttttgt ata cat gcc gga ggc aga gcc gtg att gat gtg 1200 Ile Asp His Phe CysIle His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 cta gag aagaac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 Leu Glu Lys AsnLeu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tca acg ttacat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 Ser Thr Leu HisArg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gag ttg gcatac ata gaa gca aaa gga agg atg aag aaa ggt aat aaa 1344 Glu Leu Ala TyrIle Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtt tgg cagatt gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 Val Trp Gln IleAla Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtg gctcta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 Trp Val Ala LeuAsn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 cac tgcatc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488 His Cys IleAsp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495 tca gagact cgt gtc cca aac ggt cgg tcc taa 1521 Ser Glu Thr Arg Val Pro Asn GlyArg Ser 500 505 12 506 PRT Artificial Sequence 5′ 114 amino acids fromA. thaliana FAE1 (SEQ ID NO2) and 3′ 392 amino acids from B. napuselongase KCS (SEQ ID NO4) having mutations at residues 91 and 92;designated At114 L91C K92R 12 Met Thr Ser Val Asn Val Lys Leu Leu TyrArg Tyr Val Leu Thr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro LeuThr Ala Phe Leu Ala Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp LeuHis Asn Phe Leu Ser Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr LeuLeu Phe Ala Phe Thr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr ArgPro Asn Pro Val Tyr Leu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro ProPro His Cys Arg Val Ser Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr GlnIle Arg Lys Ala Asp Thr Ser Ser 100 105 110 Arg Asn Gly Thr Cys Asp AsnSer Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser GlyLeu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135 140 Leu Leu Gln Val ProPro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 Thr Glu GlnVal Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Asn ValAsn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 PheAsn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215220 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225230 235 240 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr TyrAsn 245 250 255 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn CysLeu Phe 260 265 270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys ProGly Asp Arg 275 280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val ArgThr His Thr Gly 290 295 300 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln GlnGly Asp Asp Glu Asn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser LysAsp Ile Thr Asp Val Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile AlaThr Leu Gly Pro Leu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu PhePhe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile LysHis Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe CysIle His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 Leu Glu LysAsn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser ThrLeu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 GluLeu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455460 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465470 475 480 His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser GlyLys 485 490 495 Ser Glu Thr Arg Val Pro Asn Gly Arg Ser 500 505 13 1521DNA Artificial Sequence 5′ 342 bp from A. thaliana FAE1 (SEQ ID NO1) and3′ 1179 bp from B. napus elongase KCS (SEQ ID NO3), having a mutation atposition 275; designated At114 K92R 13 atg acg tcc gtt aac gtt aag ctcctt tac cgt tat gtc tta acc aac 48 Met Thr Ser Val Asn Val Lys Leu LeuTyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccgtta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro LeuThr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg ctt acc ata aac gat ctccac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu HisAsn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ata aca gta act tta ctcttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile Thr Val Thr Leu Leu PheAla Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atc gta acc cga ccc aatccg gtt tat ctc gtt 240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn ProVal Tyr Leu Val 65 70 75 80 gac tac tcg tgt tac ctt ccg cca ccg cat ctcaga gtt agt gtc tct 288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu ArgVal Ser Val Ser 85 90 95 aaa gtc atg gat att ttc tac caa ata aga aaa gctgat act tct tca 336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala AspThr Ser Ser 100 105 110 cgg aac ggc acg tgt gat gat tcg tcg tgg ctt gacttc ttg agg aag 384 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp PheLeu Arg Lys 115 120 125 att caa gaa cgt tca ggt cta ggc gat gaa act cacggg ccc gag ggg 432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His GlyPro Glu Gly 130 135 140 ctg ctt cag gtc cct ccc cgg aag act ttt gcg gcggcg cgt gaa gag 480 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala AlaArg Glu Glu 145 150 155 160 acg gag caa gtt atc att ggt gcg cta gaa aatcta ttc aag aac acc 528 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn LeuPhe Lys Asn Thr 165 170 175 aac gtt aac cct aaa gat ata ggt ata ctt gtggtg aac tca agc atg 576 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val ValAsn Ser Ser Met 180 185 190 ttt aat cca act cca tcg ctc tcc gcg atg gtcgtt aac act ttc aag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val ValAsn Thr Phe Lys 195 200 205 ctc cga agc aac gta aga agc ttt aac ctt ggtggc atg ggt tgt agt 672 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly GlyMet Gly Cys Ser 210 215 220 gcc ggc gtt ata gcc att gat cta gca aag gacttg ttg cat gtc cat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp LeuLeu His Val His 225 230 235 240 aaa aat acg tat gct ctt gtg gtg agc acagag aac atc act tat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr GluAsn Ile Thr Tyr Asn 245 250 255 att tac gct ggt gat aat agg tcc atg atggtt tca aat tgc ttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met ValSer Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctc tccaac aag cct gga gat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser AsnLys Pro Gly Asp Arg 275 280 285 aga cgg tcc aag tac gag cta gtt cac acggtt cga acg cat acc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His Thr ValArg Thr His Thr Gly 290 295 300 gct gac ggc aag tct ttt cgt tgc gtg caacaa gga gac gat gag aac 960 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln GlnGly Asp Asp Glu Asn 305 310 315 320 ggc aaa atc gga gtg agt ttg tcc aaggac ata acc gat gtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser Lys AspIle Thr Asp Val Ala Gly 325 330 335 cga acg gtt aag aaa aac ata gca acgttg ggt ccg ttg att ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala Thr LeuGly Pro Leu Ile Leu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttc gttacc ttc atg ggc aag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe Val ThrPhe Met Gly Lys Lys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tac tacgtc ccg gat ttc aaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr Tyr ValPro Asp Phe Lys Leu Ala 370 375 380 att gac cat ttt tgt ata cat gcc ggaggc aga gcc gtg att gat gtg 1200 Ile Asp His Phe Cys Ile His Ala Gly GlyArg Ala Val Ile Asp Val 385 390 395 400 cta gag aag aac cta gcc cta gcaccg atc gat gta gag gca tca aga 1248 Leu Glu Lys Asn Leu Ala Leu Ala ProIle Asp Val Glu Ala Ser Arg 405 410 415 tca acg tta cat aga ttt gga aacact tca tct agc tca ata tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn ThrSer Ser Ser Ser Ile Trp Tyr 420 425 430 gag ttg gca tac ata gaa gca aaagga agg atg aag aaa ggt aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys GlyArg Met Lys Lys Gly Asn Lys 435 440 445 gtt tgg cag att gct tta ggg tcaggc ttt aag tgt aac agt gca gtt 1392 Val Trp Gln Ile Ala Leu Gly Ser GlyPhe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtg gct cta aac aat gtc aaagct tcg aca aat agt cct tgg gaa 1440 Trp Val Ala Leu Asn Asn Val Lys AlaSer Thr Asn Ser Pro Trp Glu 465 470 475 480 cac tgc atc gac aga tac ccggtc aaa att gat tct gat tca ggt aag 1488 His Cys Ile Asp Arg Tyr Pro ValLys Ile Asp Ser Asp Ser Gly Lys 485 490 495 tca gag act cgt gtc cca aacggt cgg tcc taa 1521 Ser Glu Thr Arg Val Pro Asn Gly Arg Ser 500 505 14506 PRT Artificial Sequence 5′ 114 amino acids from A. thaliana FAE1(SEQ ID NO2) and 3′ 392 amino acids from B. napus elongase KCS (SEQ IDNO4), having a mutation at position 92; designated At114 K92R 14 Met ThrSer Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 PhePhe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 AlaSer Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 GlnHis Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 GlyLeu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Arg Val Ser Val Ser 85 90 95Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105110 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly130 135 140 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg GluGlu 145 150 155 160 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu PheLys Asn Thr 165 170 175 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val ValAsn Ser Ser Met 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met ValVal Asn Thr Phe Lys 195 200 205 Leu Arg Ser Asn Val Arg Ser Phe Asn LeuGly Gly Met Gly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu AlaLys Asp Leu Leu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu ValVal Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 Ile Tyr Ala Gly Asp AsnArg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly AlaAla Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 Arg Arg Ser LysTyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp GlyLys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 GlyLys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345350 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355360 365 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala370 375 380 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile AspVal 385 390 395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val GluAla Ser Arg 405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser SerSer Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg MetLys Lys Gly Asn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly Ser Gly PheLys Cys Asn Ser Ala Val 450 455 460 Trp Val Ala Leu Asn Asn Val Lys AlaSer Thr Asn Ser Pro Trp Glu 465 470 475 480 His Cys Ile Asp Arg Tyr ProVal Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr Arg Val ProAsn Gly Arg Ser 500 505 15 1521 DNA Artificial Sequence 5′ 342 bp fromA. thaliana FAE1 (SEQ ID NO1) and 3′ 1179 bp from B. napus elongase KCS(SEQ ID NO3), having a mutation at position 920; designated At114 G307D;hypothetical 15 atg acg tcc gtt aac gtt aag ctc ctt tac cgt tat gtc ttaacc aac 48 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu ThrAsn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccg tta acg gcg ttc ctc gccgga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala GlyLys 20 25 30 gcc tct cgg ctt acc ata aac gat ctc cac aac ttc ctt tcc tatctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu35 40 45 caa cac aac ctt ata aca gta act tta ctc ttt gct ttc act gtt ttc192 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 5055 60 ggt ttg gtt ctc tac atc gta acc cga ccc aat ccg gtt tat ctc gtt240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 6570 75 80 gac tac tcg tgt tac ctt ccg cca ccg cat ctc aaa gtt agt gtc tct288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Lys Val Ser Val Ser 8590 95 aaa gtc atg gat att ttc tac caa ata aga aaa gct gat act tct tca336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100105 110 cgg aac ggc acg tgt gat gat tcg tcg tgg ctt gac ttc ttg agg aag384 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115120 125 att caa gaa cgt tca ggt cta ggc gat gaa act cac ggg ccc gag ggg432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly 130135 140 ctg ctt cag gtc cct ccc cgg aag act ttt gcg gcg gcg cgt gaa gag480 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145150 155 160 acg gag caa gtt atc att ggt gcg cta gaa aat cta ttc aag aacacc 528 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr165 170 175 aac gtt aac cct aaa gat ata ggt ata ctt gtg gtg aac tca agcatg 576 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser Ser Met180 185 190 ttt aat cca act cca tcg ctc tcc gcg atg gtc gtt aac act ttcaag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys195 200 205 ctc cga agc aac gta aga agc ttt aac ctt ggt ggc atg ggt tgtagt 672 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser210 215 220 gcc ggc gtt ata gcc att gat cta gca aag gac ttg ttg cat gtccat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His225 230 235 240 aaa aat acg tat gct ctt gtg gtg agc aca gag aac atc acttat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr TyrAsn 245 250 255 att tac gct ggt gat aat agg tcc atg atg gtt tca aat tgcttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys LeuPhe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctc tcc aac aag cct ggagat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly AspArg 275 280 285 aga cgg tcc aag tac gag cta gtt cac acg gtt cga acg catacc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His ThrGly 290 295 300 gct gac gac aag tct ttt cgt tgc gtg caa caa gga gac gatgag aac 960 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp GluAsn 305 310 315 320 ggc aaa atc gga gtg agt ttg tcc aag gac ata acc gatgtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr Asp ValAla Gly 325 330 335 cga acg gtt aag aaa aac ata gca acg ttg ggt ccg ttgatt ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu IleLeu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttc gtt acc ttc atg ggcaag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe Met Gly LysLys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tac tac gtc ccg gat ttcaaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe LysLeu Ala 370 375 380 att gac cat ttt tgt ata cat gcc gga ggc aga gcc gtgatt gat gtg 1200 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val IleAsp Val 385 390 395 400 cta gag aag aac cta gcc cta gca ccg atc gat gtagag gca tca aga 1248 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val GluAla Ser Arg 405 410 415 tca acg tta cat aga ttt gga aac act tca tct agctca ata tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser SerIle Trp Tyr 420 425 430 gag ttg gca tac ata gaa gca aaa gga agg atg aagaaa ggt aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys LysGly Asn Lys 435 440 445 gtt tgg cag att gct tta ggg tca ggc ttt aag tgtaac agt gca gtt 1392 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 tgg gtg gct cta aac aat gtc aaa gct tcg aca aatagt cct tgg gaa 1440 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr Asn SerPro Trp Glu 465 470 475 480 cac tgc atc gac aga tac ccg gtc aaa att gattct gat tca ggt aag 1488 His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp SerAsp Ser Gly Lys 485 490 495 tca gag act cgt gtc caa aac ggt cgg tcc taa1521 Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 16 506 PRTArtificial Sequence 5′ 114 amino acids from A. thaliana FAE1 (SEQ IDNO2) and 3′ 392 amino acids from B. napus elongase KCS (SEQ ID NO4)having mutation at residue 307; designated At114 G307D; hypothetical 16Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 1015 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 2530 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 4045 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 5560 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 7075 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Lys Val Ser Val Ser 8590 95 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser100 105 110 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu ArgLys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly ProGlu Gly 130 135 140 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala AlaArg Glu Glu 145 150 155 160 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu AsnLeu Phe Lys Asn Thr 165 170 175 Asn Val Asn Pro Lys Asp Ile Gly Ile LeuVal Val Asn Ser Ser Met 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser AlaMet Val Val Asn Thr Phe Lys 195 200 205 Leu Arg Ser Asn Val Arg Ser PheAsn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile AspLeu Ala Lys Asp Leu Leu His Val His 225 230 235 240 Lys Asn Thr Tyr AlaLeu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 Ile Tyr Ala GlyAsp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 Arg Val GlyGly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 Arg ArgSer Lys Tyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 AlaAsp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys LysLeu 355 360 365 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe LysLeu Ala 370 375 380 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala ValIle Asp Val 385 390 395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile AspVal Glu Ala Ser Arg 405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr SerSer Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys GlyArg Met Lys Lys Gly Asn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly SerGly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp Val Ala Leu Asn Asn ValLys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 His Cys Ile Asp ArgTyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr ArgVal Gln Asn Gly Arg Ser 500 505 17 1518 DNA Artificial Sequence 5′ 222bp from A. thaliana FAE1 (SEQ ID NO1) and 3′ 1296 bp from B. napuselongase KCS (SEQ ID NO3) having a mutation at position 917; designatedAt74 G306D; hypothetical 17 atg acg tcc gtt aac gtt aag ctc ctt tac cgttac gtc tta acc aac 48 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg TyrVal Leu Thr Asn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccg tta acg gcgttc ctc gcc gga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala PheLeu Ala Gly Lys 20 25 30 gcc tct cgg ctt acc ata aac gat ctc cac aac ttcctt tcc tat ctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe LeuSer Tyr Leu 35 40 45 caa cac aac ctt ata aca gta act tta ctc ttt gct ttcact gtt ttc 192 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe ThrVal Phe 50 55 60 ggt ttg gtt ctc tac atc gta acc cga ccc aaa ccg gtt tacctc gtt 240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Lys Pro Val Tyr LeuVal 65 70 75 80 gag tac tca tgc tac ctt cca cca acg cat tgt aga tca agtatc tcc 288 Glu Tyr Ser Cys Tyr Leu Pro Pro Thr His Cys Arg Ser Ser IleSer 85 90 95 aag gtc atg gat atc ttt tat caa gta aga aaa gct gat cct tctcgg 336 Lys Val Met Asp Ile Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser Arg100 105 110 aac ggc acg tgc gat gac tcg tcg tgg ctt gac ttc ttg agg aagatt 384 Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys Ile115 120 125 caa gaa cgt tca ggt cta ggc gat gaa act cac ggg ccc gag gggctg 432 Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly Leu130 135 140 ctt cag gtc cct ccc cgg aag act ttt gcg gcg gcg cgt gaa gagacg 480 Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu Thr145 150 155 160 gag caa gtt atc att ggt gcg cta gaa aat cta ttc aag aacacc aac 528 Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn ThrAsn 165 170 175 gtt aac cct aaa gat ata ggt ata ctt gtg gtg aac tca agcatg ttt 576 Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser Ser MetPhe 180 185 190 aat cca act cca tcg ctc tcc gcg atg gtc gtt aac act ttcaag ctc 624 Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe LysLeu 195 200 205 cga agc aac gta aga agc ttt aac ctt ggt ggc atg ggt tgtagt gcc 672 Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys SerAla 210 215 220 ggc gtt ata gcc att gat cta gca aag gac ttg ttg cat gtccat aaa 720 Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val HisLys 225 230 235 240 aat acg tat gct ctt gtg gtg agc aca gag aac atc acttat aac att 768 Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr TyrAsn Ile 245 250 255 tac gct ggt gat aat agg tcc atg atg gtt tca aat tgcttg ttc cgt 816 Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys LeuPhe Arg 260 265 270 gtt ggt ggg gcc gct att ttg ctc tcc aac aag cct ggagat cgt aga 864 Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly AspArg Arg 275 280 285 cgg tcc aag tac gag cta gtt cac acg gtt cga acg catacc gga gct 912 Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His ThrGly Ala 290 295 300 gac gac aag tct ttt cgt tgc gtg caa caa gga gac gatgag aac ggc 960 Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp GluAsn Gly 305 310 315 320 aaa atc gga gtg agt ttg tcc aag gac ata acc gatgtt gct ggt cga 1008 Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr Asp ValAla Gly Arg 325 330 335 acg gtt aag aaa aac ata gca acg ttg ggt ccg ttgatt ctt ccg tta 1056 Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu IleLeu Pro Leu 340 345 350 agc gag aaa ctt ctt ttt ttc gtt acc ttc atg ggcaag aaa ctt ttc 1104 Ser Glu Lys Leu Leu Phe Phe Val Thr Phe Met Gly LysLys Leu Phe 355 360 365 aaa gat aaa atc aaa cat tac tac gtc ccg gat ttcaaa ctt gct att 1152 Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe LysLeu Ala Ile 370 375 380 gac cat ttt tgt ata cat gcc gga ggc aga gcc gtgatt gat gtg cta 1200 Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val IleAsp Val Leu 385 390 395 400 gag aag aac cta gcc cta gca ccg atc gat gtagag gca tca aga tca 1248 Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val GluAla Ser Arg Ser 405 410 415 acg tta cat aga ttt gga aac act tca tct agctca ata tgg tat gag 1296 Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser SerIle Trp Tyr Glu 420 425 430 ttg gca tac ata gaa gca aaa gga agg atg aagaaa ggt aat aaa gtt 1344 Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys LysGly Asn Lys Val 435 440 445 tgg cag att gct tta ggg tca ggc ttt aag tgtaac agt gca gtt tgg 1392 Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val Trp 450 455 460 gtg gct cta aac aat gtc aaa gct tcg aca aatagt cct tgg gaa cac 1440 Val Ala Leu Asn Asn Val Lys Ala Ser Thr Asn SerPro Trp Glu His 465 470 475 480 tgc atc gac aga tac ccg gtc aaa att gattct gat tca ggt aag tca 1488 Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp SerAsp Ser Gly Lys Ser 485 490 495 gag act cgt gtc caa aac ggt cgg tcc taa1518 Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 18 505 PRT ArtificialSequence 5′ 74 amino acids from A. thaliana FAE1 (SEQ ID NO2) and 3′ 431amino acids from B. napus elongase KCS (SEQ ID NO4) having a mutation atresidue 306; designated At74 G306D; hypothetical 18 Met Thr Ser Val AsnVal Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 Ala Ser Arg LeuThr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 Gly Leu Val LeuTyr Ile Val Thr Arg Pro Lys Pro Val Tyr Leu Val 65 70 75 80 Glu Tyr SerCys Tyr Leu Pro Pro Thr His Cys Arg Ser Ser Ile Ser 85 90 95 Lys Val MetAsp Ile Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser Arg 100 105 110 Asn GlyThr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys Ile 115 120 125 GlnGlu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly Leu 130 135 140Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu Thr 145 150155 160 Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr Asn165 170 175 Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser Ser MetPhe 180 185 190 Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr PheLys Leu 195 200 205 Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met GlyCys Ser Ala 210 215 220 Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu LeuHis Val His Lys 225 230 235 240 Asn Thr Tyr Ala Leu Val Val Ser Thr GluAsn Ile Thr Tyr Asn Ile 245 250 255 Tyr Ala Gly Asp Asn Arg Ser Met MetVal Ser Asn Cys Leu Phe Arg 260 265 270 Val Gly Gly Ala Ala Ile Leu LeuSer Asn Lys Pro Gly Asp Arg Arg 275 280 285 Arg Ser Lys Tyr Glu Leu ValHis Thr Val Arg Thr His Thr Gly Ala 290 295 300 Asp Asp Lys Ser Phe ArgCys Val Gln Gln Gly Asp Asp Glu Asn Gly 305 310 315 320 Lys Ile Gly ValSer Leu Ser Lys Asp Ile Thr Asp Val Ala Gly Arg 325 330 335 Thr Val LysLys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro Leu 340 345 350 Ser GluLys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu Phe 355 360 365 LysAsp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala Ile 370 375 380Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val Leu 385 390395 400 Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg Ser405 410 415 Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp TyrGlu 420 425 430 Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly AsnLys Val 435 440 445 Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn SerAla Val Trp 450 455 460 Val Ala Leu Asn Asn Val Lys Ala Ser Thr Asn SerPro Trp Glu His 465 470 475 480 Cys Ile Asp Arg Tyr Pro Val Lys Ile AspSer Asp Ser Gly Lys Ser 485 490 495 Glu Thr Arg Val Gln Asn Gly Arg Ser500 505 19 1521 DNA Artificial Sequence 5′ 342 bp from A. thaliana FAE1(SEQ ID NO1) and 3′ 1179 bp from B. napus elongase KCS (SEQ ID NO3)having mutations at positions 271, 272, 275 and 920; designated At114L91C K92R G307D; hypothetical 19 atg acg tcc gtt aac gtt aag ctc ctt taccgt tat gtc tta acc aac 48 Met Thr Ser Val Asn Val Lys Leu Leu Tyr ArgTyr Val Leu Thr Asn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccg tta acggcg ttc ctc gcc gga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr AlaPhe Leu Ala Gly Lys 20 25 30 gcc tct cgg ctt acc ata aac gat ctc cac aacttc ctt tcc tat ctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn PheLeu Ser Tyr Leu 35 40 45 caa cac aac ctt ata aca gta act tta ctc ttt gctttc act gtt ttc 192 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala PheThr Val Phe 50 55 60 ggt ttg gtt ctc tac atc gta acc cga ccc aat ccg gtttat ctc gtt 240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val TyrLeu Val 65 70 75 80 gac tac tcg tgt tac ctt ccg cca ccg cat tgc aga gttagt gtc tct 288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Cys Arg Val SerVal Ser 85 90 95 aaa gtc atg gat att ttc tac caa ata aga aaa gct gat acttct tca 336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr SerSer 100 105 110 cgg aac ggc acg tgt gat aat tcg tcg tgg ctt gac ttc ttgagg aag 384 Arg Asn Gly Thr Cys Asp Asn Ser Ser Trp Leu Asp Phe Leu ArgLys 115 120 125 att caa gaa cgt tca ggt cta ggc gat gaa act cac ggg cccgag ggg 432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro GluGly 130 135 140 ctg ctt cag gtc cct ccc cgg aag act ttt gcg gcg gcg cgtgaa gag 480 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg GluGlu 145 150 155 160 acg gag caa gtt atc att ggt gcg cta gaa aat cta ttcaag aac acc 528 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe LysAsn Thr 165 170 175 aac gtt aac cct aaa gat ata ggt ata ctt gtg gtg aactca agc atg 576 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn SerSer Met 180 185 190 ttt aat cca act cca tcg ctc tcc gcg atg gtc gtt aacact ttc aag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn ThrPhe Lys 195 200 205 ctc cga agc aac gta aga agc ttt aac ctt ggt ggc atgggt tgt agt 672 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met GlyCys Ser 210 215 220 gcc ggc gtt ata gcc att gat cta gca aag gac ttg ttgcat gtc cat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu HisVal His 225 230 235 240 aaa aat acg tat gct ctt gtg gtg agc aca gag aacatc act tat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn IleThr Tyr Asn 245 250 255 att tac gct ggt gat aat agg tcc atg atg gtt tcaaat tgc ttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser AsnCys Leu Phe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctc tcc aac aagcct gga gat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys ProGly Asp Arg 275 280 285 aga cgg tcc aag tac gag cta gtt cac acg gtt cgaacg cat acc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg ThrHis Thr Gly 290 295 300 gct gac gac aag tct ttt cgt tgc gtg caa caa ggagac gat gag aac 960 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly AspAsp Glu Asn 305 310 315 320 ggc aaa atc gga gtg agt ttg tcc aag gac ataacc gat gtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile ThrAsp Val Ala Gly 325 330 335 cga acg gtt aag aaa aac ata gca acg ttg ggtccg ttg att ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly ProLeu Ile Leu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttc gtt acc ttcatg ggc aag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe MetGly Lys Lys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tac tac gtc ccggat ttc aaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro AspPhe Lys Leu Ala 370 375 380 att gac cat ttt tgt ata cat gcc gga ggc agagcc gtg att gat gtg 1200 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg AlaVal Ile Asp Val 385 390 395 400 cta gag aag aac cta gcc cta gca ccg atcgat gta gag gca tca aga 1248 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile AspVal Glu Ala Ser Arg 405 410 415 tca acg tta cat aga ttt gga aac act tcatct agc tca ata tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn Thr Ser SerSer Ser Ile Trp Tyr 420 425 430 gag ttg gca tac ata gaa gca aaa gga aggatg aag aaa ggt aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg MetLys Lys Gly Asn Lys 435 440 445 gtt tgg cag att gct tta ggg tca ggc tttaag tgt aac agt gca gtt 1392 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe LysCys Asn Ser Ala Val 450 455 460 tgg gtg gct cta aac aat gtc aaa gct tcgaca aat agt cct tgg gaa 1440 Trp Val Ala Leu Asn Asn Val Lys Ala Ser ThrAsn Ser Pro Trp Glu 465 470 475 480 cac tgc atc gac aga tac ccg gtc aaaatt gat tct gat tca ggt aag 1488 His Cys Ile Asp Arg Tyr Pro Val Lys IleAsp Ser Asp Ser Gly Lys 485 490 495 tca gag act cgt gtc caa aac ggt cggtcc taa 1521 Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 20 506 PRTArtificial Sequence 5′ 114 amino acids from A. thaliana FAE1 (SEQ IDNO2) and 3′ 392 amino acids from B. napus elongase KCS (SEQ ID NO4)having mutations at positions 91, 92 and 307; designated At114 L91C K92RG307D; hypothetical 20 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg TyrVal Leu Thr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr AlaPhe Leu Ala Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp Leu His AsnPhe Leu Ser Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr Leu Leu PheAla Phe Thr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro AsnPro Val Tyr Leu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro HisCys Arg Val Ser Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr Gln Ile ArgLys Ala Asp Thr Ser Ser 100 105 110 Arg Asn Gly Thr Cys Asp Asn Ser SerTrp Leu Asp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu GlyAsp Glu Thr His Gly Pro Glu Gly 130 135 140 Leu Leu Gln Val Pro Pro ArgLys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 Thr Glu Gln Val IleIle Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Asn Val Asn ProLys Asp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn ProThr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu ArgSer Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 AlaGly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235240 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245250 255 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe260 265 270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly AspArg 275 280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr HisThr Gly 290 295 300 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly AspAsp Glu Asn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp IleThr Asp Val Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr LeuGly Pro Leu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe ValThr Phe Met Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys His TyrTyr Val Pro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys Ile HisAla Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 Leu Glu Lys Asn LeuAla Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu HisArg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu AlaTyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Val TrpGln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 TrpVal Ala Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475480 His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485490 495 Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 21 1521 DNAArtificial Sequence 5′ 342 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′1179 bp from B. napus elongase KCS (SEQ ID NO3) having mutations atpositions 275 and 920; designated At114 K92R G307D; hypothetical 21 atgacg tcc gtt aac gtt aag ctc ctt tac cgt tat gtc tta acc aac 48 Met ThrSer Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 tttttc aac ctc tgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe PheAsn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tctcgg ctt acc ata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser ArgLeu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aacctt ata aca gta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctctac atc gta acc cga ccc aat ccg gtt tat ctc gtt 240 Gly Leu Val Leu TyrIle Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgttac ctt ccg cca ccg cat ctc aga gtt agt gtc tct 288 Asp Tyr Ser Cys TyrLeu Pro Pro Pro His Leu Arg Val Ser Val Ser 85 90 95 aaa gtc atg gat attttc tac caa ata aga aaa gct gat act tct tca 336 Lys Val Met Asp Ile PheTyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105 110 cgg aac ggc acg tgtgat gat tcg tcg tgg ctt gac ttc ttg agg aag 384 Arg Asn Gly Thr Cys AspAsp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 att caa gaa cgt tcaggt cta ggc gat gaa act cac ggg ccc gag ggg 432 Ile Gln Glu Arg Ser GlyLeu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135 140 ctg ctt cag gtc cctccc cgg aag act ttt gcg gcg gcg cgt gaa gag 480 Leu Leu Gln Val Pro ProArg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 acg gag caa gttatc att ggt gcg cta gaa aat cta ttc aag aac acc 528 Thr Glu Gln Val IleIle Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aac cctaaa gat ata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn Pro LysAsp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca actcca tcg ctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aacgta aga agc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser Asn ValArg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gtt atagcc att gat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val Ile AlaIle Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aat acgtat gct ctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn Thr TyrAla Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tac gctggt gat aat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala GlyAsp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggtggg gcc gct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val Gly GlyAla Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cgg tccaag tac gag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg Ser LysTyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gac gacaag tct ttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp Asp LysSer Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaaatc gga gtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly Lys IleGly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cga acggtt aag aaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr ValLys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agcgag aaa ctt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser GluLys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaagat aaa atc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys AspLys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 att gaccat ttt tgt ata cat gcc gga ggc aga gcc gtg att gat gtg 1200 Ile Asp HisPhe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 ctagag aag aac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 Leu GluLys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tcaacg tta cat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 Ser ThrLeu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gagttg gca tac ata gaa gca aaa gga agg atg aag aaa ggt aat aaa 1344 Glu LeuAla Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtttgg cag att gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 Val TrpGln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgggtg gct cta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 Trp ValAla Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480cac tgc atc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495tca gag act cgt gtc caa aac ggt cgg tcc taa 1521 Ser Glu Thr Arg Val GlnAsn Gly Arg Ser 500 505 22 506 PRT Artificial Sequence 5′ 114 aminoacids from A. thaliana FAE1 (SEQ ID NO2) and 3′ 392 amino acids from B.napus elongase KCS (SEQ ID NO4) having mutations at positions 92 and307; designated At114 K92R G307D; hypothetical 22 Met Thr Ser Val AsnVal Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 Ala Ser Arg LeuThr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 Gly Leu Val LeuTyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 Asp Tyr SerCys Tyr Leu Pro Pro Pro His Leu Arg Val Ser Val Ser 85 90 95 Lys Val MetAsp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105 110 Arg AsnGly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 IleGln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135 140Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150155 160 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr165 170 175 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser SerMet 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn ThrPhe Lys 195 200 205 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly MetGly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp LeuLeu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu Val Val Ser ThrGlu Asn Ile Thr Tyr Asn 245 250 255 Ile Tyr Ala Gly Asp Asn Arg Ser MetMet Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly Ala Ala Ile LeuLeu Ser Asn Lys Pro Gly Asp Arg 275 280 285 Arg Arg Ser Lys Tyr Glu LeuVal His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp Asp Lys Ser PheArg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 Gly Lys Ile GlyVal Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 Arg Thr ValLys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 Leu SerGlu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 PheLys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile TrpTyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys GlyAsn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr AsnSer Pro Trp Glu 465 470 475 480 His Cys Ile Asp Arg Tyr Pro Val Lys IleAsp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr Arg Val Gln Asn Gly ArgSer 500 505 23 1521 DNA Artificial Sequence 5′ 762 bp from A. thalianaFAE1 (SEQ ID NO1) and 3′ 759 bp from B. napus elongase KCS (SEQ ID NO3);designated At254 23 atg acg tcc gtt aac gtt aag ctc ctt tac cgt tac gtctta acc aac 48 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val LeuThr Asn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccg tta acg gcg ttc ctcgcc gga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu AlaGly Lys 20 25 30 gcc tct cgg ctt acc ata aac gat ctc cac aac ttc ctt tcctat ctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu Ser TyrLeu 35 40 45 caa cac aac ctt ata aca gta act tta ctc ttt gct ttc act gttttc 192 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe50 55 60 ggt ttg gtt ctc tac atc gta acc cga ccc aat ccg gtt tat ctc gtt240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 6570 75 80 gac tac tcg tgt tac ctt cca cca ccg cat ctc aaa gtt agt gtc tct288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Lys Val Ser Val Ser 8590 95 aaa gtc atg gat att ttc tac caa ata aga aaa gct gat act tct tca336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100105 110 cgg aac gtg gca tgt gat gat ccg tcc tcg ctc gat ttc ctg agg aag384 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115120 125 att caa gag cgt tca ggt cta ggt gat gag acg tac agt cct gag gga432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr Tyr Ser Pro Glu Gly 130135 140 ctc att cac gta cca ccg cgg aag act ttt gca gcg tca cgt gaa gag480 Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala Ala Ser Arg Glu Glu 145150 155 160 aca gag aag gtt atc atc ggt gcg ctc gaa aat cta ttc gag aacacc 528 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Glu Asn Thr165 170 175 aaa gtt aac cct aga gag att ggt ata ctt gtg gtg aac tca agcatg 576 Lys Val Asn Pro Arg Glu Ile Gly Ile Leu Val Val Asn Ser Ser Met180 185 190 ttt aat cca act cct tcg cta tcc gct atg gtc gtt aat act ttcaag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys195 200 205 ctc cga agc aac atc aaa agc ttt aat cta gga gga atg ggt tgtagt 672 Leu Arg Ser Asn Ile Lys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser210 215 220 gct ggt gtt att gcc att gat ttg gct aaa gac ttg ttg cat gttcat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His225 230 235 240 aaa aac act tat gct ctc gtg gtg agc aca gag aac atc acttat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr TyrAsn 245 250 255 att tac gct ggt gat aat agg tcc atg atg gtt tca aat tgcttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys LeuPhe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctc tcc aac aag cct ggagat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly AspArg 275 280 285 aga cgg tcc aag tac gag cta gtt cac acg gtt cga acg catacc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His ThrGly 290 295 300 gct gac ggc aag tct ttt cgt tgc gtg caa caa gga gac gatgag aac 960 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp GluAsn 305 310 315 320 ggc aaa atc gga gtg agt ttg tcc aag gac ata acc gatgtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr Asp ValAla Gly 325 330 335 cga acg gtt aag aaa aac ata gca acg ttg ggt ccg ttgatt ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu IleLeu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttc gtt acc ttc atg ggcaag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe Met Gly LysLys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tac tac gtc ccg gat ttcaaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe LysLeu Ala 370 375 380 att gac cat ttt tgt ata cat gcc gga ggc aga gcc gtgatt gat gtg 1200 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val IleAsp Val 385 390 395 400 cta gag aag aac cta gcc cta gca ccg atc gat gtagag gca tca aga 1248 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val GluAla Ser Arg 405 410 415 tca acg tta cat aga ttt gga aac act tca tct agctca ata tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser SerIle Trp Tyr 420 425 430 gag ttg gca tac ata gaa gca aaa gga agg atg aagaaa ggt aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys LysGly Asn Lys 435 440 445 gtt tgg cag att gct tta ggg tca ggc ttt aag tgtaac agt gca gtt 1392 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 tgg gtg gct cta aac aat gtc aaa gct tcg aca aatagt cct tgg gaa 1440 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr Asn SerPro Trp Glu 465 470 475 480 cac tgc atc gac aga tac ccg gtc aaa att gattct gat tca ggt aag 1488 His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp SerAsp Ser Gly Lys 485 490 495 tca gag act cgt gtc cca aac ggt cgg tcc taa1521 Ser Glu Thr Arg Val Pro Asn Gly Arg Ser 500 505 24 506 PRTArtificial Sequence 5′ 254 amino acids from A. thaliana FAE1 (SEQ IDNO2) and 3′ 252 amino acids from B. napus elongase KCS (SEQ ID NO4);designated At254 24 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr ValLeu Thr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala PheLeu Ala Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn PheLeu Ser Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe AlaPhe Thr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn ProVal Tyr Leu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His LeuLys Val Ser Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg LysAla Asp Thr Ser Ser 100 105 110 Arg Asn Val Ala Cys Asp Asp Pro Ser SerLeu Asp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly AspGlu Thr Tyr Ser Pro Glu Gly 130 135 140 Leu Ile His Val Pro Pro Arg LysThr Phe Ala Ala Ser Arg Glu Glu 145 150 155 160 Thr Glu Lys Val Ile IleGly Ala Leu Glu Asn Leu Phe Glu Asn Thr 165 170 175 Lys Val Asn Pro ArgGlu Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro ThrPro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg SerAsn Ile Lys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala GlyVal Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250255 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260265 270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg275 280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His ThrGly 290 295 300 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln Gln Gly Asp AspGlu Asn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile ThrAsp Val Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu GlyPro Leu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe Val ThrPhe Met Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys His Tyr TyrVal Pro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys Ile His AlaGly Gly Arg Ala Val Ile Asp Val 385 390 395 400 Leu Glu Lys Asn Leu AlaLeu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His ArgPhe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala TyrIle Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Val Trp GlnIle Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp ValAla Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490495 Ser Glu Thr Arg Val Pro Asn Gly Arg Ser 500 505 25 1521 DNAArtificial Sequence 5′ 519 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′1002 bp from B. napus elongase KCS (SEQ ID NO3); designated At173 25 atgacg tcc gtt aac gtt aag ctc ctt tac cgt tac gtc tta acc aac 48 Met ThrSer Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 tttttc aac ctc tgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe PheAsn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tctcgg ctt acc ata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser ArgLeu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aacctt ata aca gta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctctac atc gta acc cga ccc aat ccg gtt tat ctc gtt 240 Gly Leu Val Leu TyrIle Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgttac ctt cca cca ccg cat ctc aaa gtt agt gtc tct 288 Asp Tyr Ser Cys TyrLeu Pro Pro Pro His Leu Lys Val Ser Val Ser 85 90 95 aaa gtc atg gat attttc tac caa ata aga aaa gct gat act tct tca 336 Lys Val Met Asp Ile PheTyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105 110 cgg aac gtg gca tgtgat gat ccg tcc tcg ctc gat ttc ctg agg aag 384 Arg Asn Val Ala Cys AspAsp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115 120 125 att caa gag cgt tcaggt cta ggt gat gag acg tac agt cct gag gga 432 Ile Gln Glu Arg Ser GlyLeu Gly Asp Glu Thr Tyr Ser Pro Glu Gly 130 135 140 ctc att cac gta ccaccg cgg aag act ttt gca gcg tca cgt gaa gag 480 Leu Ile His Val Pro ProArg Lys Thr Phe Ala Ala Ser Arg Glu Glu 145 150 155 160 aca gag aag gttatc atc ggt gcg ctc gaa aat cta ttc aag aac acc 528 Thr Glu Lys Val IleIle Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aac cctaaa gat ata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn Pro LysAsp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca actcca tcg ctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aacgta aga agc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser Asn ValArg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gtt atagcc att gat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val Ile AlaIle Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aat acgtat gct ctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn Thr TyrAla Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tac gctggt gat aat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala GlyAsp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggtggg gcc gct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val Gly GlyAla Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cgg tccaag tac gag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg Ser LysTyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gac ggcaag tct ttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp Gly LysSer Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaaatc gga gtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly Lys IleGly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cga acggtt aag aaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr ValLys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agcgag aaa ctt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser GluLys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaagat aaa atc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys AspLys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 att gaccat ttt tgt ata cat gcc gga ggc aga gcc gtg att gat gtg 1200 Ile Asp HisPhe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 ctagag aag aac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 Leu GluLys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tcaacg tta cat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 Ser ThrLeu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gagttg gca tac ata gaa gca aaa gga agg atg aag aaa ggt aat aaa 1344 Glu LeuAla Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtttgg cag att gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 Val TrpGln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgggtg gct cta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 Trp ValAla Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480cac tgc atc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495tca gag act cgt gtc cma aac ggt cgg tcc taa 1521 Ser Glu Thr Arg Val XaaAsn Gly Arg Ser 500 505 26 506 PRT Artificial Sequence 5′ 173 aminoacids from A. thaliana FAE1 (SEQ ID NO2) and 3′ 333 amino acids from B.napus elongase KCS (SEQ ID NO4); designated At173 26 Met Thr Ser Val AsnVal Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 Ala Ser Arg LeuThr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 Gly Leu Val LeuTyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 Asp Tyr SerCys Tyr Leu Pro Pro Pro His Leu Lys Val Ser Val Ser 85 90 95 Lys Val MetAsp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105 110 Arg AsnVal Ala Cys Asp Asp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115 120 125 IleGln Glu Arg Ser Gly Leu Gly Asp Glu Thr Tyr Ser Pro Glu Gly 130 135 140Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala Ala Ser Arg Glu Glu 145 150155 160 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr165 170 175 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser SerMet 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn ThrPhe Lys 195 200 205 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly MetGly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp LeuLeu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu Val Val Ser ThrGlu Asn Ile Thr Tyr Asn 245 250 255 Ile Tyr Ala Gly Asp Asn Arg Ser MetMet Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly Ala Ala Ile LeuLeu Ser Asn Lys Pro Gly Asp Arg 275 280 285 Arg Arg Ser Lys Tyr Glu LeuVal His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp Gly Lys Ser PheArg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 Gly Lys Ile GlyVal Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 Arg Thr ValLys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 Leu SerGlu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 PheLys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile TrpTyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys GlyAsn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr AsnSer Pro Trp Glu 465 470 475 480 His Cys Ile Asp Arg Tyr Pro Val Lys IleAsp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr Arg Val Xaa Asn Gly ArgSer 500 505 27 1521 DNA Artificial Sequence 5′ 528 bp from B. napuselongase KCS (SEQ ID NO3) and 3′ 993 bp from A. thaliana FAE1 (SEQ IDNO1); designated Bn176 27 atg acg tcc att aac gta aag ctc ctt tac cattac gtc ata acc aac 48 Met Thr Ser Ile Asn Val Lys Leu Leu Tyr His TyrVal Ile Thr Asn 1 5 10 15 ctt ttc aac ctt tgc ttc ttt ccg tta acg gcgatc gtc gcc gga aaa 96 Leu Phe Asn Leu Cys Phe Phe Pro Leu Thr Ala IleVal Ala Gly Lys 20 25 30 gcc tat cgg ctt acc ata gac gat ctt cac cac ttatac tat tcc tat 144 Ala Tyr Arg Leu Thr Ile Asp Asp Leu His His Leu TyrTyr Ser Tyr 35 40 45 ctc caa cac aac ctc ata acc atc gct cca ctc ttt gccttc acc gtt 192 Leu Gln His Asn Leu Ile Thr Ile Ala Pro Leu Phe Ala PheThr Val 50 55 60 ttc ggt tcg gtt ctc tac atc gca acc cgg ccc aaa ccg gtttac ctc 240 Phe Gly Ser Val Leu Tyr Ile Ala Thr Arg Pro Lys Pro Val TyrLeu 65 70 75 80 gtt gag tac tca tgc tac ctt cca cca acg cat tgt aga tcaagt atc 288 Val Glu Tyr Ser Cys Tyr Leu Pro Pro Thr His Cys Arg Ser SerIle 85 90 95 tcc aag gtc atg gat atc ttt tat caa gta aga aaa gct gat ccttct 336 Ser Lys Val Met Asp Ile Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser100 105 110 cgg aac ggc acg tgc gat gac tcg tcg tgg ctt gac ttc ttg aggaag 384 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys115 120 125 att caa gaa cgt tca ggt cta ggc gat gaa act cac ggg ccc gagggg 432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly130 135 140 ctg ctt cag gtc cct ccc cgg aag act ttt gcg gcg gcg cgt gaagag 480 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu145 150 155 160 acg gag caa gtt atc att ggt gcg cta gaa aat cta ttc aagaac acc 528 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys AsnThr 165 170 175 aaa gtt aac cct aga gag att ggt ata ctt gtg gtg aac tcaagc atg 576 Lys Val Asn Pro Arg Glu Ile Gly Ile Leu Val Val Asn Ser SerMet 180 185 190 ttt aat cca act cct tcg cta tcc gct atg gtc gtt aat actttc aag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr PheLys 195 200 205 ctc cga agc aac atc aaa agc ttt aat cta gga gga atg ggttgt agt 672 Leu Arg Ser Asn Ile Lys Ser Phe Asn Leu Gly Gly Met Gly CysSer 210 215 220 gct ggt gtt att gcc att gat ttg gct aaa gac ttg ttg catgtt cat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His ValHis 225 230 235 240 aaa aac act tat gct ctt gtg gtg agc act gag aac atcaca caa ggc 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile ThrGln Gly 245 250 255 att tat gct gga gaa aat aga tca atg atg gtt agc aattgc ttg ttt 816 Ile Tyr Ala Gly Glu Asn Arg Ser Met Met Val Ser Asn CysLeu Phe 260 265 270 cgt gtt ggt ggg gcc gcg att ttg ctc tct aac aag tcggga gac cgg 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Ser GlyAsp Arg 275 280 285 aga cgg tcc aag tac aag cta gtt cac acg gtc cga acgcat act gga 912 Arg Arg Ser Lys Tyr Lys Leu Val His Thr Val Arg Thr HisThr Gly 290 295 300 gct gat gac aag tct ttt cga tgt gtg caa caa gaa gatgat gag agc 960 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Glu Asp AspGlu Ser 305 310 315 320 ggc aaa atc gga gtt tgt ctg tca aag gac ata accaat gtt gcg ggg 1008 Gly Lys Ile Gly Val Cys Leu Ser Lys Asp Ile Thr AsnVal Ala Gly 325 330 335 aca aca ctt acg aaa aat ata gca aca ttg ggt ccgttg att ctt cct 1056 Thr Thr Leu Thr Lys Asn Ile Ala Thr Leu Gly Pro LeuIle Leu Pro 340 345 350 tta agc gaa aag ttt ctt ttt ttc gct acc ttc gtcgcc aag aaa ctt 1104 Leu Ser Glu Lys Phe Leu Phe Phe Ala Thr Phe Val AlaLys Lys Leu 355 360 365 cta aag gat aaa atc aag cat tac tat gtt ccg gatttc aag ctt gct 1152 Leu Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp PheLys Leu Ala 370 375 380 gtt gac cat ttc tgt att cat gcc gga ggc aga gccgtg atc gat gag 1200 Val Asp His Phe Cys Ile His Ala Gly Gly Arg Ala ValIle Asp Glu 385 390 395 400 cta gag aag aac tta gga cta tcg ccg atc gatgtg gag gca tct aga 1248 Leu Glu Lys Asn Leu Gly Leu Ser Pro Ile Asp ValGlu Ala Ser Arg 405 410 415 tca acg tta cat aga ttt ggg aat act tca tctagc tca att tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser SerSer Ile Trp Tyr 420 425 430 gaa tta gca tac ata gag gca aag gga aga atgaag aaa ggg aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met LysLys Gly Asn Lys 435 440 445 gct tgg cag att gct tta gga tca ggg ttt aagtgt aat agt gcg gtt 1392 Ala Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys CysAsn Ser Ala Val 450 455 460 tgg gtg gct cta cgc aat gtc aag gca tcg gcaaat agt cct tgg caa 1440 Trp Val Ala Leu Arg Asn Val Lys Ala Ser Ala AsnSer Pro Trp Gln 465 470 475 480 cat tgc atc gat aga tat ccg gtt aaa attgat tct gat ttg tca aag 1488 His Cys Ile Asp Arg Tyr Pro Val Lys Ile AspSer Asp Leu Ser Lys 485 490 495 tca aag act cat gtc caa aac ggt cgg tcctaa 1521 Ser Lys Thr His Val Gln Asn Gly Arg Ser 500 505 28 506 PRTArtificial Sequence 5′ 176 amino acids from B. napus elongase KCS (SEQID NO4) and 3′ 330 amino acids from A. thaliana FAE1 (SEQ ID NO2);designated Bn176 28 Met Thr Ser Ile Asn Val Lys Leu Leu Tyr His Tyr ValIle Thr Asn 1 5 10 15 Leu Phe Asn Leu Cys Phe Phe Pro Leu Thr Ala IleVal Ala Gly Lys 20 25 30 Ala Tyr Arg Leu Thr Ile Asp Asp Leu His His LeuTyr Tyr Ser Tyr 35 40 45 Leu Gln His Asn Leu Ile Thr Ile Ala Pro Leu PheAla Phe Thr Val 50 55 60 Phe Gly Ser Val Leu Tyr Ile Ala Thr Arg Pro LysPro Val Tyr Leu 65 70 75 80 Val Glu Tyr Ser Cys Tyr Leu Pro Pro Thr HisCys Arg Ser Ser Ile 85 90 95 Ser Lys Val Met Asp Ile Phe Tyr Gln Val ArgLys Ala Asp Pro Ser 100 105 110 Arg Asn Gly Thr Cys Asp Asp Ser Ser TrpLeu Asp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly AspGlu Thr His Gly Pro Glu Gly 130 135 140 Leu Leu Gln Val Pro Pro Arg LysThr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 Thr Glu Gln Val Ile IleGly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Lys Val Asn Pro ArgGlu Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro ThrPro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg SerAsn Ile Lys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala GlyVal Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Gln Gly 245 250255 Ile Tyr Ala Gly Glu Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260265 270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Ser Gly Asp Arg275 280 285 Arg Arg Ser Lys Tyr Lys Leu Val His Thr Val Arg Thr His ThrGly 290 295 300 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Glu Asp AspGlu Ser 305 310 315 320 Gly Lys Ile Gly Val Cys Leu Ser Lys Asp Ile ThrAsn Val Ala Gly 325 330 335 Thr Thr Leu Thr Lys Asn Ile Ala Thr Leu GlyPro Leu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Phe Leu Phe Phe Ala ThrPhe Val Ala Lys Lys Leu 355 360 365 Leu Lys Asp Lys Ile Lys His Tyr TyrVal Pro Asp Phe Lys Leu Ala 370 375 380 Val Asp His Phe Cys Ile His AlaGly Gly Arg Ala Val Ile Asp Glu 385 390 395 400 Leu Glu Lys Asn Leu GlyLeu Ser Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His ArgPhe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala TyrIle Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Ala Trp GlnIle Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp ValAla Leu Arg Asn Val Lys Ala Ser Ala Asn Ser Pro Trp Gln 465 470 475 480His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Leu Ser Lys 485 490495 Ser Lys Thr His Val Gln Asn Gly Arg Ser 500 505 29 1521 DNAArtificial Sequence 5′ 1197 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′324 bp from B. napus elongase KCS (SEQ ID NO3); designated At399 29 atgacg tcc gtt aac gtt aag ctc ctt tac cgt tac gtc tta acc aac 48 Met ThrSer Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 tttttc aac ctc tgt ttg ttc ccg tta acg gcg ttc ctc gcc gga aaa 96 Phe PheAsn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tctcgg ctt acc ata aac gat ctc cac aac ttc ctt tcc tat ctc 144 Ala Ser ArgLeu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aacctt ata aca gta act tta ctc ttt gct ttc act gtt ttc 192 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctctac atc gta acc cga ccc aat ccg gtt tat ctc gtt 240 Gly Leu Val Leu TyrIle Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgttac ctt cca cca ccg cat ctc aaa gtt agt gtc tct 288 Asp Tyr Ser Cys TyrLeu Pro Pro Pro His Leu Lys Val Ser Val Ser 85 90 95 aaa gtc atg gat attttc tac caa ata aga aaa gct gat act tct tca 336 Lys Val Met Asp Ile PheTyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105 110 cgg aac gtg gca tgtgat gat ccg tcc tcg ctc gat ttc ctg agg aag 384 Arg Asn Val Ala Cys AspAsp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115 120 125 att caa gag cgt tcaggt cta ggt gat gag acg tac agt cct gag gga 432 Ile Gln Glu Arg Ser GlyLeu Gly Asp Glu Thr Tyr Ser Pro Glu Gly 130 135 140 ctc att cac gta ccaccg cgg aag act ttt gca gcg tca cgt gaa gag 480 Leu Ile His Val Pro ProArg Lys Thr Phe Ala Ala Ser Arg Glu Glu 145 150 155 160 aca gag aag gttatc atc ggt gcg ctc gaa aat cta ttc gag aac acc 528 Thr Glu Lys Val IleIle Gly Ala Leu Glu Asn Leu Phe Glu Asn Thr 165 170 175 aaa gtt aac cctaga gag att ggt ata ctt gtg gtg aac tca agc atg 576 Lys Val Asn Pro ArgGlu Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca actcct tcg cta tcc gct atg gtc gtt aat act ttc aag 624 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aacatc aaa agc ttt aat cta gga gga atg ggt tgt agt 672 Leu Arg Ser Asn IleLys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gct ggt gtt attgcc att gat ttg gct aaa gac ttg ttg cat gtt cat 720 Ala Gly Val Ile AlaIle Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aac acttat gct ctt gtg gtg agc act gag aac atc aca caa ggc 768 Lys Asn Thr TyrAla Leu Val Val Ser Thr Glu Asn Ile Thr Gln Gly 245 250 255 att tat gctgga gaa aat aga tca atg atg gtt agc aat tgc ttg ttt 816 Ile Tyr Ala GlyGlu Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggtggg gcc gcg att ttg ctc tct aac aag tcg gga gac cgg 864 Arg Val Gly GlyAla Ala Ile Leu Leu Ser Asn Lys Ser Gly Asp Arg 275 280 285 aga cgg tccaag tac aag cta gtt cac acg gtc cga acg cat act gga 912 Arg Arg Ser LysTyr Lys Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gat gacaag tct ttt cga tgt gtg caa caa gaa gac gat gag agc 960 Ala Asp Asp LysSer Phe Arg Cys Val Gln Gln Glu Asp Asp Glu Ser 305 310 315 320 ggc aaaatc gga gtt tgt ctg tca aag gac ata acc aat gtt gcg ggg 1008 Gly Lys IleGly Val Cys Leu Ser Lys Asp Ile Thr Asn Val Ala Gly 325 330 335 aca acactt acg aaa aat ata gca aca ttg ggt ccg ttg att ctt cct 1056 Thr Thr LeuThr Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agcgaa aag ttt ctt ttt ttc gct acc ttc gtc gcc aag aaa ctt 1104 Leu Ser GluLys Phe Leu Phe Phe Ala Thr Phe Val Ala Lys Lys Leu 355 360 365 cta aaggat aaa atc aag cat tac tat gtt ccg gat ttc aag ctt gct 1152 Leu Lys AspLys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 gtt gaccat ttc tgt att cat gcc gga ggc aga gcc gtg atc gat gtg 1200 Val Asp HisPhe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400 ctagag aag aac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 Leu GluLys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tcaacg tta cat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 Ser ThrLeu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gagttg gca tac ata gaa gca aaa gga agg atg aag aaa ggt aat aaa 1344 Glu LeuAla Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtttgg cag att gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 Val TrpGln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgggtg gct cta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 Trp ValAla Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480cac tgc atc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495tca gag act cgt gtc cma aac ggt cgg tcc taa 1521 Ser Glu Thr Arg Val XaaAsn Gly Arg Ser 500 505 30 506 PRT Artificial Sequence 5′ 399 aminoacids from A. thaliana FAE1 (SEQ ID NO2) and 3′ 107 amino acids from B.napus elongase KCS (SEQ ID NO4); designated At399 30 Met Thr Ser Val AsnVal Lys Leu Leu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 Phe Phe Asn LeuCys Leu Phe Pro Leu Thr Ala Phe Leu Ala Gly Lys 20 25 30 Ala Ser Arg LeuThr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu 35 40 45 Gln His Asn LeuIle Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 50 55 60 Gly Leu Val LeuTyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 65 70 75 80 Asp Tyr SerCys Tyr Leu Pro Pro Pro His Leu Lys Val Ser Val Ser 85 90 95 Lys Val MetAsp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100 105 110 Arg AsnVal Ala Cys Asp Asp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115 120 125 IleGln Glu Arg Ser Gly Leu Gly Asp Glu Thr Tyr Ser Pro Glu Gly 130 135 140Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala Ala Ser Arg Glu Glu 145 150155 160 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Glu Asn Thr165 170 175 Lys Val Asn Pro Arg Glu Ile Gly Ile Leu Val Val Asn Ser SerMet 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn ThrPhe Lys 195 200 205 Leu Arg Ser Asn Ile Lys Ser Phe Asn Leu Gly Gly MetGly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp LeuLeu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu Val Val Ser ThrGlu Asn Ile Thr Gln Gly 245 250 255 Ile Tyr Ala Gly Glu Asn Arg Ser MetMet Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly Ala Ala Ile LeuLeu Ser Asn Lys Ser Gly Asp Arg 275 280 285 Arg Arg Ser Lys Tyr Lys LeuVal His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp Asp Lys Ser PheArg Cys Val Gln Gln Glu Asp Asp Glu Ser 305 310 315 320 Gly Lys Ile GlyVal Cys Leu Ser Lys Asp Ile Thr Asn Val Ala Gly 325 330 335 Thr Thr LeuThr Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 Leu SerGlu Lys Phe Leu Phe Phe Ala Thr Phe Val Ala Lys Lys Leu 355 360 365 LeuLys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380Val Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile TrpTyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys GlyAsn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr AsnSer Pro Trp Glu 465 470 475 480 His Cys Ile Asp Arg Tyr Pro Val Lys IleAsp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr Arg Val Xaa Asn Gly ArgSer 500 505 31 1521 DNA Artificial Sequence 5′ 1197 bp from B. napuselongase KCS (SEQ ID NO3) and 3′ 324 bp from A. thaliana FAE1 (SEQ IDNO1); designated Bn399 31 atg acg tcc att aac gtt aag ctc ctt tac cattac gtc ata acc aac 48 Met Thr Ser Ile Asn Val Lys Leu Leu Tyr His TyrVal Ile Thr Asn 1 5 10 15 ctt ttc aac ctt tgc ttc ttt ccg tta acg gcgatc gtc gcc gga aaa 96 Leu Phe Asn Leu Cys Phe Phe Pro Leu Thr Ala IleVal Ala Gly Lys 20 25 30 gcc tat cgg ctt acc ata gac gat ctt cac cac ttatac tat tcc tat 144 Ala Tyr Arg Leu Thr Ile Asp Asp Leu His His Leu TyrTyr Ser Tyr 35 40 45 ctc caa cac aac ctc ata acc atc gct cca ctc ttt gccttc acc gtt 192 Leu Gln His Asn Leu Ile Thr Ile Ala Pro Leu Phe Ala PheThr Val 50 55 60 ttc ggt tcg gtt ctc tac atc gca acc cgg ccc aaa ccg gtttac ctc 240 Phe Gly Ser Val Leu Tyr Ile Ala Thr Arg Pro Lys Pro Val TyrLeu 65 70 75 80 gtt gag tac tca tgc tac ctt cca cca acg cat tgt aga tcaagt atc 288 Val Glu Tyr Ser Cys Tyr Leu Pro Pro Thr His Cys Arg Ser SerIle 85 90 95 tcc aag gtc atg gat atc ttt tat caa gta aga aaa gct gat ccttct 336 Ser Lys Val Met Asp Ile Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser100 105 110 cgg aac ggc acg tgc gat gac tcg tcg tgg ctt gac ttc ttg aggaag 384 Arg Asn Gly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys115 120 125 att caa gaa cgt tca ggt cta ggc gat gaa act cac ggg ccc gagggg 432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly130 135 140 ctg ctt cag gtc cct ccc cgg aag act ttt gcg gcg gcg cgt gaagag 480 Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu145 150 155 160 acg gag caa gtt atc att ggt gcg cta gaa aat cta ttc aagaac acc 528 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys AsnThr 165 170 175 aac gtt aac cct aaa gat ata ggt ata ctt gtg gtg aac tcaagc atg 576 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser SerMet 180 185 190 ttt aat cca act cca tcg ctc tcc gcg atg gtc gtt aac actttc aag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr PheLys 195 200 205 ctc cga agc aac gta aga agc ttt aac ctt ggt ggc atg ggttgt agt 672 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly CysSer 210 215 220 gcc ggc gtt ata gcc att gat cta gca aag gac ttg ttg catgtc cat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His ValHis 225 230 235 240 aaa aat acg tat gct ctt gtg gtg agc aca gag aac atcact tat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile ThrTyr Asn 245 250 255 att tac gct ggt gat aat agg tcc atg atg gtt tca aattgc ttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn CysLeu Phe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctc tcc aac aag cctgga gat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro GlyAsp Arg 275 280 285 aga cgg tcc aag tac gag cta gtt cac acg gtt cga acgcat acc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr HisThr Gly 290 295 300 gct gac ggc aag tct ttt cgt tgc gtg caa caa gga gacgat gag aac 960 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln Gln Gly Asp AspGlu Asn 305 310 315 320 ggc aaa atc gga gtg agt ttg tcc aag gac ata accgat gtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr AspVal Ala Gly 325 330 335 cga acg gtt aag aaa aac ata gca acg ttg ggt ccgttg att ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly Pro LeuIle Leu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttc gtt acc ttc atgggc aag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr Phe Met GlyLys Lys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tac tac gtc ccg gatttc aaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp PheLys Leu Ala 370 375 380 att gac cat ttt tgt ata cat gcc gga ggc aga gccgtg atc gat gag 1200 Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala ValIle Asp Glu 385 390 395 400 cta gag aag aac tta gga cta tcg ccg atc gatgtg gag gca tct aga 1248 Leu Glu Lys Asn Leu Gly Leu Ser Pro Ile Asp ValGlu Ala Ser Arg 405 410 415 tca acg tta cat aga ttt ggg aat act tca tctagc tca att tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser SerSer Ile Trp Tyr 420 425 430 gaa tta gca tac ata gag gca aag gga aga atgaag aaa ggg aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met LysLys Gly Asn Lys 435 440 445 gct tgg cag att gct tta gga tca ggg ttt aagtgt aat agt gcg gtt 1392 Ala Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys CysAsn Ser Ala Val 450 455 460 tgg gtg gct cta cgc aat gtc aag gca tcg gcaaat agt cct tgg caa 1440 Trp Val Ala Leu Arg Asn Val Lys Ala Ser Ala AsnSer Pro Trp Gln 465 470 475 480 cat tgc atc gat aga tat ccg gtt aaa attgat tct gat ttg tca aag 1488 His Cys Ile Asp Arg Tyr Pro Val Lys Ile AspSer Asp Leu Ser Lys 485 490 495 tca aag act cat gtc caa aac ggt cgg tcctaa 1521 Ser Lys Thr His Val Gln Asn Gly Arg Ser 500 505 32 506 PRTArtificial Sequence 5′ 399 amino acids from B. napus elongase KCS (SEQID NO3) and 3′ 107 amino acids from A. thaliana FAE1 (SEQ ID NO1);designated Bn399 32 Met Thr Ser Ile Asn Val Lys Leu Leu Tyr His Tyr ValIle Thr Asn 1 5 10 15 Leu Phe Asn Leu Cys Phe Phe Pro Leu Thr Ala IleVal Ala Gly Lys 20 25 30 Ala Tyr Arg Leu Thr Ile Asp Asp Leu His His LeuTyr Tyr Ser Tyr 35 40 45 Leu Gln His Asn Leu Ile Thr Ile Ala Pro Leu PheAla Phe Thr Val 50 55 60 Phe Gly Ser Val Leu Tyr Ile Ala Thr Arg Pro LysPro Val Tyr Leu 65 70 75 80 Val Glu Tyr Ser Cys Tyr Leu Pro Pro Thr HisCys Arg Ser Ser Ile 85 90 95 Ser Lys Val Met Asp Ile Phe Tyr Gln Val ArgLys Ala Asp Pro Ser 100 105 110 Arg Asn Gly Thr Cys Asp Asp Ser Ser TrpLeu Asp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly AspGlu Thr His Gly Pro Glu Gly 130 135 140 Leu Leu Gln Val Pro Pro Arg LysThr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 Thr Glu Gln Val Ile IleGly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Asn Val Asn Pro LysAsp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro ThrPro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg SerAsn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala GlyVal Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250255 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260265 270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg275 280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His ThrGly 290 295 300 Ala Asp Gly Lys Ser Phe Arg Cys Val Gln Gln Gly Asp AspGlu Asn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile ThrAsp Val Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu GlyPro Leu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe Val ThrPhe Met Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys His Tyr TyrVal Pro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys Ile His AlaGly Gly Arg Ala Val Ile Asp Glu 385 390 395 400 Leu Glu Lys Asn Leu GlyLeu Ser Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His ArgPhe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala TyrIle Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Ala Trp GlnIle Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp ValAla Leu Arg Asn Val Lys Ala Ser Ala Asn Ser Pro Trp Gln 465 470 475 480His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Leu Ser Lys 485 490495 Ser Lys Thr His Val Gln Asn Gly Arg Ser 500 505 33 1524 DNAArtificial Sequence 1524 bp from B. napus elongase KCS (SEQ ID NO3)having a mutation at position 920; designated Bn G307D; hypothetical 33atg acg tcc att aac gta aag ctc ctt tac cat tac gtc ata acc aac 48 MetThr Ser Ile Asn Val Lys Leu Leu Tyr His Tyr Val Ile Thr Asn 1 5 10 15ctt ttc aac ctt tgc ttc ttt ccg tta acg gcg atc gtc gcc gga aaa 96 LeuPhe Asn Leu Cys Phe Phe Pro Leu Thr Ala Ile Val Ala Gly Lys 20 25 30 gcctat cgg ctt acc ata gac gat ctt cac cac tta tac tat tcc tat 144 Ala TyrArg Leu Thr Ile Asp Asp Leu His His Leu Tyr Tyr Ser Tyr 35 40 45 ctc caacac aac ctc ata acc atc gct cca ctc ttt gcc ttc acc gtt 192 Leu Gln HisAsn Leu Ile Thr Ile Ala Pro Leu Phe Ala Phe Thr Val 50 55 60 ttc ggt tcggtt ctc tac atc gca acc cgg ccc aaa ccg gtt tac ctc 240 Phe Gly Ser ValLeu Tyr Ile Ala Thr Arg Pro Lys Pro Val Tyr Leu 65 70 75 80 gtt gag tactca tgc tac ctt cca cca acg cat tgt aga tca agt atc 288 Val Glu Tyr SerCys Tyr Leu Pro Pro Thr His Cys Arg Ser Ser Ile 85 90 95 tcc aag gtc atggat atc ttt tat caa gta aga aaa gct gat cct tct 336 Ser Lys Val Met AspIle Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser 100 105 110 cgg aac ggc acgtgc gat gac tcg tcg tgg ctt gac ttc ttg agg aag 384 Arg Asn Gly Thr CysAsp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 att caa gaa cgttca ggt cta ggc gat gaa act cac ggg ccc gag ggg 432 Ile Gln Glu Arg SerGly Leu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135 140 ctg ctt cag gtccct ccc cgg aag act ttt gcg gcg gcg cgt gaa gag 480 Leu Leu Gln Val ProPro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 acg gag caagtt atc att ggt gcg cta gaa aat cta ttc aag aac acc 528 Thr Glu Gln ValIle Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aaccct aaa gat ata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn ProLys Asp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat ccaact cca tcg ctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro ThrPro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agcaac gta aga agc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser AsnVal Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gttata gcc att gat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val IleAla Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aatacg tat gct ctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn ThrTyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tacgct ggt gat aat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr AlaGly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gttggt ggg gcc gct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val GlyGly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cggtcc aag tac gag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg SerLys Tyr Glu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gacgac aag tct ttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp AspLys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggcaaa atc gga gtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly LysIle Gly Val Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cgaacg gtt aag aaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg ThrVal Lys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 ttaagc gag aaa ctt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu SerGlu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttcaaa gat aaa atc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe LysAsp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 attgac cat ttt tgt ata cat gcc gga ggc aga gcc gtg att gat gtg 1200 Ile AspHis Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390 395 400cta gag aag aac cta gcc cta gca ccg atc gat gta gag gca tca aga 1248 LeuGlu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg 405 410 415tca acg tta cat aga ttt gga aac act tca tct agc tca ata tgg tat 1296 SerThr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430gag ttg gca tac ata gaa gca aaa gga agg atg aag aaa ggt aat aaa 1344 GluLeu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445gtt tgg cag att gct tta ggg tca ggc ttt aag tgt aac agt gca gtt 1392 ValTrp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460tgg gtg gct cta aac aat gtc aaa gct tcg aca aat agt cct tgg gaa 1440 TrpVal Ala Leu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475480 cac tgc atc gac aga tac ccg gtc aaa att gat tct gat tca ggt aag 1488His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490495 tca gag act cgt gtc caa aac ggt cgg tcc taataa 1524 Ser Glu Thr ArgVal Gln Asn Gly Arg Ser 500 505 34 506 PRT Artificial Sequence 506 aminoacids from B. napus elongase KCS (SEQ ID NO4) having a mutation atresidue 307; designated Bn G307D; hypothetical 34 Met Thr Ser Ile AsnVal Lys Leu Leu Tyr His Tyr Val Ile Thr Asn 1 5 10 15 Leu Phe Asn LeuCys Phe Phe Pro Leu Thr Ala Ile Val Ala Gly Lys 20 25 30 Ala Tyr Arg LeuThr Ile Asp Asp Leu His His Leu Tyr Tyr Ser Tyr 35 40 45 Leu Gln His AsnLeu Ile Thr Ile Ala Pro Leu Phe Ala Phe Thr Val 50 55 60 Phe Gly Ser ValLeu Tyr Ile Ala Thr Arg Pro Lys Pro Val Tyr Leu 65 70 75 80 Val Glu TyrSer Cys Tyr Leu Pro Pro Thr His Cys Arg Ser Ser Ile 85 90 95 Ser Lys ValMet Asp Ile Phe Tyr Gln Val Arg Lys Ala Asp Pro Ser 100 105 110 Arg AsnGly Thr Cys Asp Asp Ser Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 IleGln Glu Arg Ser Gly Leu Gly Asp Glu Thr His Gly Pro Glu Gly 130 135 140Leu Leu Gln Val Pro Pro Arg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150155 160 Thr Glu Gln Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr165 170 175 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val Val Asn Ser SerMet 180 185 190 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn ThrPhe Lys 195 200 205 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly MetGly Cys Ser 210 215 220 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp LeuLeu His Val His 225 230 235 240 Lys Asn Thr Tyr Ala Leu Val Val Ser ThrGlu Asn Ile Thr Tyr Asn 245 250 255 Ile Tyr Ala Gly Asp Asn Arg Ser MetMet Val Ser Asn Cys Leu Phe 260 265 270 Arg Val Gly Gly Ala Ala Ile LeuLeu Ser Asn Lys Pro Gly Asp Arg 275 280 285 Arg Arg Ser Lys Tyr Glu LeuVal His Thr Val Arg Thr His Thr Gly 290 295 300 Ala Asp Asp Lys Ser PheArg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 Gly Lys Ile GlyVal Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 Arg Thr ValLys Lys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 Leu SerGlu Lys Leu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 PheLys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380Ile Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val Ile Asp Val 385 390395 400 Leu Glu Lys Asn Leu Ala Leu Ala Pro Ile Asp Val Glu Ala Ser Arg405 410 415 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile TrpTyr 420 425 430 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys GlyAsn Lys 435 440 445 Val Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 Trp Val Ala Leu Asn Asn Val Lys Ala Ser Thr AsnSer Pro Trp Glu 465 470 475 480 His Cys Ile Asp Arg Tyr Pro Val Lys IleAsp Ser Asp Ser Gly Lys 485 490 495 Ser Glu Thr Arg Val Gln Asn Gly ArgSer 500 505 35 1709 DNA Artificial Sequence 1709 bp from A. thalianaFAE1 (SEQ ID NO1) having a mutation at position 275; designated At K92R;hypothetical 35 atg acg tcc gtt aac gtt aag ctc ctt tac cgt tac gtc ttaacc aac 48 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val Leu ThrAsn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccg tta acg gcg ttc ctc gccgga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe Leu Ala GlyLys 20 25 30 gcc tct cgg ctt acc ata aac gat ctc cac aac ttc ctt tcc tatctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe Leu Ser Tyr Leu35 40 45 caa cac aac ctt ata aca gta act tta ctc ttt gct ttc act gtt ttc192 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala Phe Thr Val Phe 5055 60 ggt ttg gtt ctc tac atc gta acc cga ccc aat ccg gtt tat ctc gtt240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro Val Tyr Leu Val 6570 75 80 gac tac tcg tgt tac ctt cca cca ccg cat ctc aga gtt agt gtc tct288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu Arg Val Ser Val Ser 8590 95 aaa gtc atg gat att ttc tac caa ata aga aaa gct gat act tct tca336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala Asp Thr Ser Ser 100105 110 cgg aac gtg gca tgt gat gat ccg tcc tcg ctc gat ttc ctg agg aag384 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser Leu Asp Phe Leu Arg Lys 115120 125 att caa gag cgt tca ggt cta ggt gat gag acg tac agt cct gag gga432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr Tyr Ser Pro Glu Gly 130135 140 ctc att cac gta cca ccg cgg aag act ttt gca gcg tca cgt gaa gag480 Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala Ala Ser Arg Glu Glu 145150 155 160 aca gag aag gtt atc atc ggt gcg ctc gaa aat cta ttc gag aacacc 528 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu Asn Leu Phe Glu Asn Thr165 170 175 aaa gtt aac cct aga gag att ggt ata ctt gtg gtg aac tca agcatg 576 Lys Val Asn Pro Arg Glu Ile Gly Ile Leu Val Val Asn Ser Ser Met180 185 190 ttt aat cca act cct tcg cta tcc gct atg gtc gtt aat act ttcaag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys195 200 205 ctc cga agc aac atc aaa agc ttt aat cta gga gga atg ggt tgtagt 672 Leu Arg Ser Asn Ile Lys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser210 215 220 gct ggt gtt att gcc att gat ttg gct aaa gac ttg ttg cat gttcat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His225 230 235 240 aaa aac act tat gct ctt gtg gtg agc act gag aac atc acacaa ggc 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr GlnGly 245 250 255 att tat gct gga gaa aat aga tca atg atg gtt agc aat tgcttg ttt 816 Ile Tyr Ala Gly Glu Asn Arg Ser Met Met Val Ser Asn Cys LeuPhe 260 265 270 cgt gtt ggt ggg gcc gcg att ttg ctc tct aac aag tcg ggagac cgg 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Ser Gly AspArg 275 280 285 aga cgg tcc aag tac aag cta gtt cac acg gtc cga acg catact gga 912 Arg Arg Ser Lys Tyr Lys Leu Val His Thr Val Arg Thr His ThrGly 290 295 300 gct gat gac aag tct ttt cga tgt gtg caa caa gaa gac gatgag agc 960 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Glu Asp Asp GluSer 305 310 315 320 ggc aaa atc gga gtt tgt ctg tca aag gac ata acc aatgtt gcg ggg 1008 Gly Lys Ile Gly Val Cys Leu Ser Lys Asp Ile Thr Asn ValAla Gly 325 330 335 aca aca ctt acg aaa aat ata gca aca ttg ggt ccg ttgatt ctt cct 1056 Thr Thr Leu Thr Lys Asn Ile Ala Thr Leu Gly Pro Leu IleLeu Pro 340 345 350 tta agc gaa aag ttt ctt ttt ttc gct acc ttc gtc gccaag aaa ctt 1104 Leu Ser Glu Lys Phe Leu Phe Phe Ala Thr Phe Val Ala LysLys Leu 355 360 365 cta aag gat aaa atc aag cat tac tat gtt ccg gat ttcaag ctt gct 1152 Leu Lys Asp Lys Ile Lys His Tyr Tyr Val Pro Asp Phe LysLeu Ala 370 375 380 gtt gac cat ttc tgt att cat gcc gga ggc aga gcc gtgatc gat gag 1200 Val Asp His Phe Cys Ile His Ala Gly Gly Arg Ala Val IleAsp Glu 385 390 395 400 cta gag aag aac tta gga cta tcg ccg atc gat gtggag gca tct aga 1248 Leu Glu Lys Asn Leu Gly Leu Ser Pro Ile Asp Val GluAla Ser Arg 405 410 415 tca acg tta cat aga ttt ggg aat act tca tct agctca att tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn Thr Ser Ser Ser SerIle Trp Tyr 420 425 430 gaa tta gca tac ata gag gca aag gga aga atg aagaaa ggg aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys Gly Arg Met Lys LysGly Asn Lys 435 440 445 gct tgg cag att gct tta gga tca ggg ttt aag tgtaat agt gcg gtt 1392 Ala Trp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys AsnSer Ala Val 450 455 460 tgg gtg gct cta cgc aat gtc aag gca tcg gca aatagt cct tgg caa 1440 Trp Val Ala Leu Arg Asn Val Lys Ala Ser Ala Asn SerPro Trp Gln 465 470 475 480 cat tgc atc gat aga tat ccg gtt aaa att gattct gat ttg tca aag 1488 His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp SerAsp Leu Ser Lys 485 490 495 tca aag act cat gtc caa aac ggt cgg tcctaatttgatg tatctgagtg 1538 Ser Lys Thr His Val Gln Asn Gly Arg Ser 500505 ccaacgttta ctttgtcttt cctttctttt attggttatg aattagatgt ttactaatgt1598 tcctctcttt ttcgttataa ataaagaagt tcaattcttc ctatagtttc aaacgcgatt1658 ttaagcgttt ctatttaggt ttacatgaat ttcttttaca aaccatcttt t 1709 36506 PRT Artificial Sequence 506 amino acids from A. thaliana FAE1 (SEQID NO2) having a mutation at residue 92; designated At K92R;hypothetical 36 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val LeuThr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe LeuAla Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe LeuSer Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala PheThr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro ValTyr Leu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu ArgVal Ser Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys AlaAsp Thr Ser Ser 100 105 110 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser LeuAsp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp GluThr Tyr Ser Pro Glu Gly 130 135 140 Leu Ile His Val Pro Pro Arg Lys ThrPhe Ala Ala Ser Arg Glu Glu 145 150 155 160 Thr Glu Lys Val Ile Ile GlyAla Leu Glu Asn Leu Phe Glu Asn Thr 165 170 175 Lys Val Asn Pro Arg GluIle Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg Ser AsnIle Lys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala Gly ValIle Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 LysAsn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Gln Gly 245 250 255Ile Tyr Ala Gly Glu Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Ser Gly Asp Arg 275280 285 Arg Arg Ser Lys Tyr Lys Leu Val His Thr Val Arg Thr His Thr Gly290 295 300 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Glu Asp Asp GluSer 305 310 315 320 Gly Lys Ile Gly Val Cys Leu Ser Lys Asp Ile Thr AsnVal Ala Gly 325 330 335 Thr Thr Leu Thr Lys Asn Ile Ala Thr Leu Gly ProLeu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Phe Leu Phe Phe Ala Thr PheVal Ala Lys Lys Leu 355 360 365 Leu Lys Asp Lys Ile Lys His Tyr Tyr ValPro Asp Phe Lys Leu Ala 370 375 380 Val Asp His Phe Cys Ile His Ala GlyGly Arg Ala Val Ile Asp Glu 385 390 395 400 Leu Glu Lys Asn Leu Gly LeuSer Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His Arg PheGly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr IleGlu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Ala Trp Gln IleAla Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp Val AlaLeu Arg Asn Val Lys Ala Ser Ala Asn Ser Pro Trp Gln 465 470 475 480 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Leu Ser Lys 485 490 495Ser Lys Thr His Val Gln Asn Gly Arg Ser 500 505 37 1521 DNA ArtificialSequence 5′ 762 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′ 759 bp fromB. napus elongase KCS (SEQ ID NO3) and having a mutation at position920; designated At254 G307D; hypothetical 37 atg acg tcc gtt aac gtt aagctc ctt tac cgt tac gtc tta acc aac 48 Met Thr Ser Val Asn Val Lys LeuLeu Tyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aac ctc tgt ttg ttcccg tta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn Leu Cys Leu Phe ProLeu Thr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg ctt acc ata aac gatctc cac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu Thr Ile Asn Asp LeuHis Asn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ata aca gta act ttactc ttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile Thr Val Thr Leu LeuPhe Ala Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atc gta acc cga cccaat ccg gtt tat ctc gtt 240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro AsnPro Val Tyr Leu Val 65 70 75 80 gac tac tcg tgt tac ctt cca cca ccg catctc aaa gtt agt gtc tct 288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His LeuLys Val Ser Val Ser 85 90 95 aaa gtc atg gat att ttc tac caa ata aga aaagct gat act tct tca 336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys AlaAsp Thr Ser Ser 100 105 110 cgg aac gtg gca tgt gat gat ccg tcc tcg ctcgat ttc ctg agg aag 384 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser Leu AspPhe Leu Arg Lys 115 120 125 att caa gag cgt tca ggt cta ggt gat gag acgtac agt cct gag gga 432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr TyrSer Pro Glu Gly 130 135 140 ctc att cac gta cca ccg cgg aag act ttt gcagcg tca cgt gaa gag 480 Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala AlaSer Arg Glu Glu 145 150 155 160 aca gag aag gtt atc atc ggt gcg ctc gaaaat cta ttc gag aac acc 528 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu AsnLeu Phe Glu Asn Thr 165 170 175 aaa gtt aac cct aga gag att ggt ata cttgtg gtg aac tca agc atg 576 Lys Val Asn Pro Arg Glu Ile Gly Ile Leu ValVal Asn Ser Ser Met 180 185 190 ttt aat cca act cct tcg cta tcc gct atggtc gtt aat act ttc aag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met ValVal Asn Thr Phe Lys 195 200 205 ctc cga agc aac atc aaa agc ttt aat ctagga gga atg ggt tgt agt 672 Leu Arg Ser Asn Ile Lys Ser Phe Asn Leu GlyGly Met Gly Cys Ser 210 215 220 gct ggt gtt att gcc att gat ttg gct aaagac ttg ttg cat gtt cat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys AspLeu Leu His Val His 225 230 235 240 aaa aac act tat gct ctc gtg gtg agcaca gag aac atc act tat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser ThrGlu Asn Ile Thr Tyr Asn 245 250 255 att tac gct ggt gat aat agg tcc atgatg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met MetVal Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctctcc aac aag cct gga gat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu SerAsn Lys Pro Gly Asp Arg 275 280 285 aga cgg tcc aag tac gag cta gtt cacacg gtt cga acg cat acc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His ThrVal Arg Thr His Thr Gly 290 295 300 gct gac gac aag tct ttt cgt tgc gtgcaa caa gga gac gat gag aac 960 Ala Asp Asp Lys Ser Phe Arg Cys Val GlnGln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaa atc gga gtg agt ttg tccaag gac ata acc gat gtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser LysAsp Ile Thr Asp Val Ala Gly 325 330 335 cga acg gtt aag aaa aac ata gcaacg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala ThrLeu Gly Pro Leu Ile Leu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttcgtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe ValThr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tactac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr TyrVal Pro Asp Phe Lys Leu Ala 370 375 380 att gac cat ttt tgt ata cat gccgga ggc aga gcc gtg att gat gtg 1200 Ile Asp His Phe Cys Ile His Ala GlyGly Arg Ala Val Ile Asp Val 385 390 395 400 cta gag aag aac cta gcc ctagca ccg atc gat gta gag gca tca aga 1248 Leu Glu Lys Asn Leu Ala Leu AlaPro Ile Asp Val Glu Ala Ser Arg 405 410 415 tca acg tta cat aga ttt ggaaac act tca tct agc tca ata tgg tat 1296 Ser Thr Leu His Arg Phe Gly AsnThr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gag ttg gca tac ata gaa gcaaaa gga agg atg aag aaa ggt aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala LysGly Arg Met Lys Lys Gly Asn Lys 435 440 445 gtt tgg cag att gct tta gggtca ggc ttt aag tgt aac agt gca gtt 1392 Val Trp Gln Ile Ala Leu Gly SerGly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtg gct cta aac aat gtcaaa gct tcg aca aat agt cct tgg gaa 1440 Trp Val Ala Leu Asn Asn Val LysAla Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 cac tgc atc gac aga tacccg gtc aaa att gat tct gat tca ggt aag 1488 His Cys Ile Asp Arg Tyr ProVal Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495 tca gag act cgt gtc caaaac ggt cgg tcc taa 1521 Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 50538 506 PRT Artificial Sequence 5′ 254 amino acids from A. thaliana FAE1(SEQ ID NO2) and 3′ 252 amino acids from B. napus elongase KCS (SEQ IDNO4) having a mutation at residue 307; designated At254 G307D;hypothetical 38 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val LeuThr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe LeuAla Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe LeuSer Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala PheThr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro ValTyr Leu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu LysVal Ser Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys AlaAsp Thr Ser Ser 100 105 110 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser LeuAsp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp GluThr Tyr Ser Pro Glu Gly 130 135 140 Leu Ile His Val Pro Pro Arg Lys ThrPhe Ala Ala Ser Arg Glu Glu 145 150 155 160 Thr Glu Lys Val Ile Ile GlyAla Leu Glu Asn Leu Phe Glu Asn Thr 165 170 175 Lys Val Asn Pro Arg GluIle Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg Ser AsnIle Lys Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala Gly ValIle Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 LysAsn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His Thr Gly290 295 300 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp GluAsn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr AspVal Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly ProLeu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr PheMet Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys His Tyr Tyr ValPro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys Ile His Ala GlyGly Arg Ala Val Ile Asp Val 385 390 395 400 Leu Glu Lys Asn Leu Ala LeuAla Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His Arg PheGly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr IleGlu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Val Trp Gln IleAla Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp Val AlaLeu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 39 1521 DNA ArtificialSequence 5′ 519 bp from A. thaliana FAE1 (SEQ ID NO1) and 3′ 1002 bpfrom B. napus elongase KCS (SEQ ID NO3) and having a mutation atposition 920; designated At173 G307D 39 atg acg tcc gtt aac gtt aag ctcctt tac cgt tac gtc tta acc aac 48 Met Thr Ser Val Asn Val Lys Leu LeuTyr Arg Tyr Val Leu Thr Asn 1 5 10 15 ttt ttc aac ctc tgt ttg ttc ccgtta acg gcg ttc ctc gcc gga aaa 96 Phe Phe Asn Leu Cys Leu Phe Pro LeuThr Ala Phe Leu Ala Gly Lys 20 25 30 gcc tct cgg ctt acc ata aac gat ctccac aac ttc ctt tcc tat ctc 144 Ala Ser Arg Leu Thr Ile Asn Asp Leu HisAsn Phe Leu Ser Tyr Leu 35 40 45 caa cac aac ctt ata aca gta act tta ctcttt gct ttc act gtt ttc 192 Gln His Asn Leu Ile Thr Val Thr Leu Leu PheAla Phe Thr Val Phe 50 55 60 ggt ttg gtt ctc tac atc gta acc cga ccc aatccg gtt tat ctc gtt 240 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn ProVal Tyr Leu Val 65 70 75 80 gac tac tcg tgt tac ctt cca cca ccg cat ctcaaa gtt agt gtc tct 288 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu LysVal Ser Val Ser 85 90 95 aaa gtc atg gat att ttc tac caa ata aga aaa gctgat act tct tca 336 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys Ala AspThr Ser Ser 100 105 110 cgg aac gtg gca tgt gat gat ccg tcc tcg ctc gatttc ctg agg aag 384 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser Leu Asp PheLeu Arg Lys 115 120 125 att caa gag cgt tca ggt cta ggt gat gag acg tacagt cct gag gga 432 Ile Gln Glu Arg Ser Gly Leu Gly Asp Glu Thr Tyr SerPro Glu Gly 130 135 140 ctc att cac gta cca ccg cgg aag act ttt gca gcgtca cgt gaa gag 480 Leu Ile His Val Pro Pro Arg Lys Thr Phe Ala Ala SerArg Glu Glu 145 150 155 160 aca gag aag gtt atc atc ggt gcg ctc gaa aatcta ttc aag aac acc 528 Thr Glu Lys Val Ile Ile Gly Ala Leu Glu Asn LeuPhe Lys Asn Thr 165 170 175 aac gtt aac cct aaa gat ata ggt ata ctt gtggtg aac tca agc atg 576 Asn Val Asn Pro Lys Asp Ile Gly Ile Leu Val ValAsn Ser Ser Met 180 185 190 ttt aat cca act cca tcg ctc tcc gcg atg gtcgtt aac act ttc aag 624 Phe Asn Pro Thr Pro Ser Leu Ser Ala Met Val ValAsn Thr Phe Lys 195 200 205 ctc cga agc aac gta aga agc ttt aac ctt ggtggc atg ggt tgt agt 672 Leu Arg Ser Asn Val Arg Ser Phe Asn Leu Gly GlyMet Gly Cys Ser 210 215 220 gcc ggc gtt ata gcc att gat cta gca aag gacttg ttg cat gtc cat 720 Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp LeuLeu His Val His 225 230 235 240 aaa aat acg tat gct ctt gtg gtg agc acagag aac atc act tat aac 768 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr GluAsn Ile Thr Tyr Asn 245 250 255 att tac gct ggt gat aat agg tcc atg atggtt tca aat tgc ttg ttc 816 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met ValSer Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggg gcc gct att ttg ctc tccaac aag cct gga gat cgt 864 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser AsnLys Pro Gly Asp Arg 275 280 285 aga cgg tcc aag tac gag cta gtt cac acggtt cga acg cat acc gga 912 Arg Arg Ser Lys Tyr Glu Leu Val His Thr ValArg Thr His Thr Gly 290 295 300 gct gac gac aag tct ttt cgt tgc gtg caacaa gga gac gat gag aac 960 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln GlnGly Asp Asp Glu Asn 305 310 315 320 ggc aaa atc gga gtg agt ttg tcc aaggac ata acc gat gtt gct ggt 1008 Gly Lys Ile Gly Val Ser Leu Ser Lys AspIle Thr Asp Val Ala Gly 325 330 335 cga acg gtt aag aaa aac ata gca acgttg ggt ccg ttg att ctt ccg 1056 Arg Thr Val Lys Lys Asn Ile Ala Thr LeuGly Pro Leu Ile Leu Pro 340 345 350 tta agc gag aaa ctt ctt ttt ttc gttacc ttc atg ggc aag aaa ctt 1104 Leu Ser Glu Lys Leu Leu Phe Phe Val ThrPhe Met Gly Lys Lys Leu 355 360 365 ttc aaa gat aaa atc aaa cat tac tacgtc ccg gat ttc aaa ctt gct 1152 Phe Lys Asp Lys Ile Lys His Tyr Tyr ValPro Asp Phe Lys Leu Ala 370 375 380 att gac cat ttt tgt ata cat gcc ggaggc aga gcc gtg att gat gtg 1200 Ile Asp His Phe Cys Ile His Ala Gly GlyArg Ala Val Ile Asp Val 385 390 395 400 cta gag aag aac cta gcc cta gcaccg atc gat gta gag gca tca aga 1248 Leu Glu Lys Asn Leu Ala Leu Ala ProIle Asp Val Glu Ala Ser Arg 405 410 415 tca acg tta cat aga ttt gga aacact tca tct agc tca ata tgg tat 1296 Ser Thr Leu His Arg Phe Gly Asn ThrSer Ser Ser Ser Ile Trp Tyr 420 425 430 gag ttg gca tac ata gaa gca aaagga agg atg aag aaa ggt aat aaa 1344 Glu Leu Ala Tyr Ile Glu Ala Lys GlyArg Met Lys Lys Gly Asn Lys 435 440 445 gtt tgg cag att gct tta ggg tcaggc ttt aag tgt aac agt gca gtt 1392 Val Trp Gln Ile Ala Leu Gly Ser GlyPhe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtg gct cta aac aat gtc aaagct tcg aca aat agt cct tgg gaa 1440 Trp Val Ala Leu Asn Asn Val Lys AlaSer Thr Asn Ser Pro Trp Glu 465 470 475 480 cac tgc atc gac aga tac ccggtc aaa att gat tct gat tca ggt aag 1488 His Cys Ile Asp Arg Tyr Pro ValLys Ile Asp Ser Asp Ser Gly Lys 485 490 495 tca gag act cgt gtc caa aacggt cgg tcc taa 1521 Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 40506 PRT Artificial Sequence 5′ 173 amino acids from A. thaliana FAE1(SEQ ID NO2) and 3′ 333 amino acids from B. napus elongase KCS (SEQ IDNO4) having a mutation at residue 307; designated At173 G307D;hypothetical 40 Met Thr Ser Val Asn Val Lys Leu Leu Tyr Arg Tyr Val LeuThr Asn 1 5 10 15 Phe Phe Asn Leu Cys Leu Phe Pro Leu Thr Ala Phe LeuAla Gly Lys 20 25 30 Ala Ser Arg Leu Thr Ile Asn Asp Leu His Asn Phe LeuSer Tyr Leu 35 40 45 Gln His Asn Leu Ile Thr Val Thr Leu Leu Phe Ala PheThr Val Phe 50 55 60 Gly Leu Val Leu Tyr Ile Val Thr Arg Pro Asn Pro ValTyr Leu Val 65 70 75 80 Asp Tyr Ser Cys Tyr Leu Pro Pro Pro His Leu LysVal Ser Val Ser 85 90 95 Lys Val Met Asp Ile Phe Tyr Gln Ile Arg Lys AlaAsp Thr Ser Ser 100 105 110 Arg Asn Val Ala Cys Asp Asp Pro Ser Ser LeuAsp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly Leu Gly Asp GluThr Tyr Ser Pro Glu Gly 130 135 140 Leu Ile His Val Pro Pro Arg Lys ThrPhe Ala Ala Ser Arg Glu Glu 145 150 155 160 Thr Glu Lys Val Ile Ile GlyAla Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Asn Val Asn Pro Lys AspIle Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe Asn Pro Thr ProSer Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 Leu Arg Ser AsnVal Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 Ala Gly ValIle Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 LysAsn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg Thr His Thr Gly290 295 300 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln Gly Asp Asp GluAsn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys Asp Ile Thr AspVal Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala Thr Leu Gly ProLeu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe Phe Val Thr PheMet Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys His Tyr Tyr ValPro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys Ile His Ala GlyGly Arg Ala Val Ile Asp Val 385 390 395 400 Leu Glu Lys Asn Leu Ala LeuAla Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr Leu His Arg PheGly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu Leu Ala Tyr IleGlu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 Val Trp Gln IleAla Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 Trp Val AlaLeu Asn Asn Val Lys Ala Ser Thr Asn Ser Pro Trp Glu 465 470 475 480 HisCys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Ser Gly Lys 485 490 495Ser Glu Thr Arg Val Gln Asn Gly Arg Ser 500 505 41 1521 DNA ArtificialSequence 5′ 1197 bp from B. napus elongase KCS (SEQ ID NO3) and 3′ 324bp from A. thaliana FAE1 (SEQ ID NO1) and having a mutation atnucleotide position 920; designated Bn399 G307D; hypothetical 41 atg acgtcc att aac gtt aag ctc ctt tac cat tac gtc ata acc aac 48 Met Thr SerIle Asn Val Lys Leu Leu Tyr His Tyr Val Ile Thr Asn 1 5 10 15 ctt ttcaac ctt tgc ttc ttt ccg tta acg gcg atc gtc gcc gga aaa 96 Leu Phe AsnLeu Cys Phe Phe Pro Leu Thr Ala Ile Val Ala Gly Lys 20 25 30 gcc tat cggctt acc ata gac gat ctt cac cac tta tac tat tcc tat 144 Ala Tyr Arg LeuThr Ile Asp Asp Leu His His Leu Tyr Tyr Ser Tyr 35 40 45 ctc caa cac aacctc ata acc atc gct cca ctc ttt gcc ttc acc gtt 192 Leu Gln His Asn LeuIle Thr Ile Ala Pro Leu Phe Ala Phe Thr Val 50 55 60 ttc ggt tcg gtt ctctac atc gca acc cgg ccc aaa ccg gtt tac ctc 240 Phe Gly Ser Val Leu TyrIle Ala Thr Arg Pro Lys Pro Val Tyr Leu 65 70 75 80 gtt gag tac tca tgctac ctt cca cca acg cat tgt aga tca agt atc 288 Val Glu Tyr Ser Cys TyrLeu Pro Pro Thr His Cys Arg Ser Ser Ile 85 90 95 tcc aag gtc atg gat atcttt tat caa gta aga aaa gct gat cct tct 336 Ser Lys Val Met Asp Ile PheTyr Gln Val Arg Lys Ala Asp Pro Ser 100 105 110 cgg aac ggc acg tgc gatgac tcg tcg tgg ctt gac ttc ttg agg aag 384 Arg Asn Gly Thr Cys Asp AspSer Ser Trp Leu Asp Phe Leu Arg Lys 115 120 125 att caa gaa cgt tca ggtcta ggc gat gaa act cac ggg ccc gag ggg 432 Ile Gln Glu Arg Ser Gly LeuGly Asp Glu Thr His Gly Pro Glu Gly 130 135 140 ctg ctt cag gtc cct ccccgg aag act ttt gcg gcg gcg cgt gaa gag 480 Leu Leu Gln Val Pro Pro ArgLys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 acg gag caa gtt atcatt ggt gcg cta gaa aat cta ttc aag aac acc 528 Thr Glu Gln Val Ile IleGly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 aac gtt aac cct aaagat ata ggt ata ctt gtg gtg aac tca agc atg 576 Asn Val Asn Pro Lys AspIle Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 ttt aat cca act ccatcg ctc tcc gcg atg gtc gtt aac act ttc aag 624 Phe Asn Pro Thr Pro SerLeu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 ctc cga agc aac gtaaga agc ttt aac ctt ggt ggc atg ggt tgt agt 672 Leu Arg Ser Asn Val ArgSer Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220 gcc ggc gtt ata gccatt gat cta gca aag gac ttg ttg cat gtc cat 720 Ala Gly Val Ile Ala IleAsp Leu Ala Lys Asp Leu Leu His Val His 225 230 235 240 aaa aat acg tatgct ctt gtg gtg agc aca gag aac atc act tat aac 768 Lys Asn Thr Tyr AlaLeu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn 245 250 255 att tac gct ggtgat aat agg tcc atg atg gtt tca aat tgc ttg ttc 816 Ile Tyr Ala Gly AspAsn Arg Ser Met Met Val Ser Asn Cys Leu Phe 260 265 270 cgt gtt ggt ggggcc gct att ttg ctc tcc aac aag cct gga gat cgt 864 Arg Val Gly Gly AlaAla Ile Leu Leu Ser Asn Lys Pro Gly Asp Arg 275 280 285 aga cgg tcc aagtac gag cta gtt cac acg gtt cga acg cat acc gga 912 Arg Arg Ser Lys TyrGlu Leu Val His Thr Val Arg Thr His Thr Gly 290 295 300 gct gac gac aagtct ttt cgt tgc gtg caa caa gga gac gat gag aac 960 Ala Asp Asp Lys SerPhe Arg Cys Val Gln Gln Gly Asp Asp Glu Asn 305 310 315 320 ggc aaa atcgga gtg agt ttg tcc aag gac ata acc gat gtt gct ggt 1008 Gly Lys Ile GlyVal Ser Leu Ser Lys Asp Ile Thr Asp Val Ala Gly 325 330 335 cga acg gttaag aaa aac ata gca acg ttg ggt ccg ttg att ctt ccg 1056 Arg Thr Val LysLys Asn Ile Ala Thr Leu Gly Pro Leu Ile Leu Pro 340 345 350 tta agc gagaaa ctt ctt ttt ttc gtt acc ttc atg ggc aag aaa ctt 1104 Leu Ser Glu LysLeu Leu Phe Phe Val Thr Phe Met Gly Lys Lys Leu 355 360 365 ttc aaa gataaa atc aaa cat tac tac gtc ccg gat ttc aaa ctt gct 1152 Phe Lys Asp LysIle Lys His Tyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 att gac catttt tgt ata cat gcc gga ggc aga gcc gtg atc gat gag 1200 Ile Asp His PheCys Ile His Ala Gly Gly Arg Ala Val Ile Asp Glu 385 390 395 400 cta gagaag aac tta gga cta tcg ccg atc gat gtg gag gca tct aga 1248 Leu Glu LysAsn Leu Gly Leu Ser Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 tca acgtta cat aga ttt ggg aat act tca tct agc tca att tgg tat 1296 Ser Thr LeuHis Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 gaa ttagca tac ata gag gca aag gga aga atg aag aaa ggg aat aaa 1344 Glu Leu AlaTyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 gct tggcag att gct tta gga tca ggg ttt aag tgt aat agt gcg gtt 1392 Ala Trp GlnIle Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460 tgg gtggct cta cgc aat gtc aag gca tcg gca aat agt cct tgg caa 1440 Trp Val AlaLeu Arg Asn Val Lys Ala Ser Ala Asn Ser Pro Trp Gln 465 470 475 480 cattgc atc gat aga tat ccg gtt aaa att gat tct gat ttg tca aag 1488 His CysIle Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Leu Ser Lys 485 490 495 tcaaag act cat gtc caa aac ggt cgg tcc taa 1521 Ser Lys Thr His Val Gln AsnGly Arg Ser 500 505 42 506 PRT Artificial Sequence 5′ 399 amino acidsfrom B. napus elongase KCS (SEQ ID NO3) and 3′ 107 amino acids from A.thaliana FAE1 (SEQ ID NO1) having a mutation at residue 306; designatedBn399 G307D; hypothetical 42 Met Thr Ser Ile Asn Val Lys Leu Leu Tyr HisTyr Val Ile Thr Asn 1 5 10 15 Leu Phe Asn Leu Cys Phe Phe Pro Leu ThrAla Ile Val Ala Gly Lys 20 25 30 Ala Tyr Arg Leu Thr Ile Asp Asp Leu HisHis Leu Tyr Tyr Ser Tyr 35 40 45 Leu Gln His Asn Leu Ile Thr Ile Ala ProLeu Phe Ala Phe Thr Val 50 55 60 Phe Gly Ser Val Leu Tyr Ile Ala Thr ArgPro Lys Pro Val Tyr Leu 65 70 75 80 Val Glu Tyr Ser Cys Tyr Leu Pro ProThr His Cys Arg Ser Ser Ile 85 90 95 Ser Lys Val Met Asp Ile Phe Tyr GlnVal Arg Lys Ala Asp Pro Ser 100 105 110 Arg Asn Gly Thr Cys Asp Asp SerSer Trp Leu Asp Phe Leu Arg Lys 115 120 125 Ile Gln Glu Arg Ser Gly LeuGly Asp Glu Thr His Gly Pro Glu Gly 130 135 140 Leu Leu Gln Val Pro ProArg Lys Thr Phe Ala Ala Ala Arg Glu Glu 145 150 155 160 Thr Glu Gln ValIle Ile Gly Ala Leu Glu Asn Leu Phe Lys Asn Thr 165 170 175 Asn Val AsnPro Lys Asp Ile Gly Ile Leu Val Val Asn Ser Ser Met 180 185 190 Phe AsnPro Thr Pro Ser Leu Ser Ala Met Val Val Asn Thr Phe Lys 195 200 205 LeuArg Ser Asn Val Arg Ser Phe Asn Leu Gly Gly Met Gly Cys Ser 210 215 220Ala Gly Val Ile Ala Ile Asp Leu Ala Lys Asp Leu Leu His Val His 225 230235 240 Lys Asn Thr Tyr Ala Leu Val Val Ser Thr Glu Asn Ile Thr Tyr Asn245 250 255 Ile Tyr Ala Gly Asp Asn Arg Ser Met Met Val Ser Asn Cys LeuPhe 260 265 270 Arg Val Gly Gly Ala Ala Ile Leu Leu Ser Asn Lys Pro GlyAsp Arg 275 280 285 Arg Arg Ser Lys Tyr Glu Leu Val His Thr Val Arg ThrHis Thr Gly 290 295 300 Ala Asp Asp Lys Ser Phe Arg Cys Val Gln Gln GlyAsp Asp Glu Asn 305 310 315 320 Gly Lys Ile Gly Val Ser Leu Ser Lys AspIle Thr Asp Val Ala Gly 325 330 335 Arg Thr Val Lys Lys Asn Ile Ala ThrLeu Gly Pro Leu Ile Leu Pro 340 345 350 Leu Ser Glu Lys Leu Leu Phe PheVal Thr Phe Met Gly Lys Lys Leu 355 360 365 Phe Lys Asp Lys Ile Lys HisTyr Tyr Val Pro Asp Phe Lys Leu Ala 370 375 380 Ile Asp His Phe Cys IleHis Ala Gly Gly Arg Ala Val Ile Asp Glu 385 390 395 400 Leu Glu Lys AsnLeu Gly Leu Ser Pro Ile Asp Val Glu Ala Ser Arg 405 410 415 Ser Thr LeuHis Arg Phe Gly Asn Thr Ser Ser Ser Ser Ile Trp Tyr 420 425 430 Glu LeuAla Tyr Ile Glu Ala Lys Gly Arg Met Lys Lys Gly Asn Lys 435 440 445 AlaTrp Gln Ile Ala Leu Gly Ser Gly Phe Lys Cys Asn Ser Ala Val 450 455 460Trp Val Ala Leu Arg Asn Val Lys Ala Ser Ala Asn Ser Pro Trp Gln 465 470475 480 His Cys Ile Asp Arg Tyr Pro Val Lys Ile Asp Ser Asp Leu Ser Lys485 490 495 Ser Lys Thr His Val Gln Asn Gly Arg Ser 500 505 43 25 DNAArtificial Sequence primer for PCR 43 gcgctcgaaa atctattcaa gaaca 25 4433 DNA Artificial Sequence primer for PCR 44 gttcttgaat agattttcgagcgcaccgat gat 33 45 28 DNA Artificial Sequence primer for PCR 45cggaacggca cgtgtgatga ttcgtcct 28 46 28 DNA Artificial Sequence primerfor PCR 46 aggacggatc atcacacgcg acgttccg 28 47 23 DNA ArtificialSequence primer for PCR 47 cccaaaccgg tttacctcgt tga 23 48 23 DNAArtificial Sequence primer for PCR 48 tcaacgaggt aaaccggatt ggg 23 49 27DNA Artificial Sequence primer for PCR 49 ccgcattgca gagttagtgt ctctaaa27 50 27 DNA Artificial Sequence primer for PCR 50 tttagagaca ctaactctgcaatgcgg 27 51 27 DNA Artificial Sequence primer for PCR 51 ccaccgcatctcagagttag tgtctct 27 52 27 DNA Artificial Sequence primer for PCR 52agagacacta actctgagat gcggtgg 27 53 33 DNA Artificial Sequence primerfor PCR 53 ggggatccat gacgtccgtt aacgttaagc tcc 33 54 31 DNA ArtificialSequence primer for PCR 54 ccgaattctt aggaccgacc gttttggaca c 31 55 33DNA Artificial Sequence primer for PCR 55 ggggatccat gacgtccattaacgtaaagc tcc 33 56 38 DNA Artificial Sequence primer for PCR 56ccgaattctt aggaccgacc gttttggaca tgagtctt 38

What is claimed is:
 1. A polypeptide comprising in the amino-terminal to carboxy-terminal direction: (a) a first polypeptide segment, wherein said first polypeptide segment has membrane anchoring properties; joined to (b) a second polypeptide segment having a sequence selected from the group consisting of residues 75-114 of SEQ ID NO:12 and residues 75-114 of SEQ ID NO:14; joined to (c) a third polypeptide segment having at least 40% sequence identity to residues 115-506 of SEQ ID NO:4.
 2. The polypeptide of claim 1, wherein said third polypeptide segment has at least 50% sequence identity to residues 115-506 of SEQ ID NO:4.
 3. The polypeptide of claim 2, wherein said third polypeptide segment has an aspartic acid at the position corresponding to amino acid 307 of SEQ ID NO:4.
 4. The polypeptide of claim 3, wherein said polypeptide has the amino acid sequence of SEQ ID NO:20.
 5. The polypeptide of claim 3, wherein said polypeptide has the amino acid sequence of SEQ ID NO:22.
 6. The polypeptide of claim 3, wherein said polypeptide has the amino acid sequence of SEQ ID NO:34.
 7. The polypeptide of claim 3, wherein said polypeptide has the amino acid sequence of SEQ ID NO:36.
 8. The polypeptide of claim 1, wherein said polypeptide catalyzes the condensation of malonyl CoA and a C18 fatty acyl substrate, leading to the synthesis of a C20 fatty acyl CoA.
 9. The polypeptide of claim 8, wherein said C18 fatty acyl substrate is an oleoyl substrate.
 10. The polypeptide of claim 1, wherein said polypeptide catalyzes the condensation of malonyl CoA and a C20 fatty acyl substrate, leading to the synthesis of a C22 fatty acyl CoA.
 11. The polypeptide of claim 10, wherein said C20 fatty acyl substrate is an eicosenoyl substrate.
 12. A nucleic acid encoding the polypeptide of claim
 1. 13. A nucleic acid encoding the polypeptide of claim
 2. 14. A nucleic acid encoding the polypeptide of claim
 3. 15. Host cells containing a nucleic acid encoding the polypeptide of claim
 1. 16. Host cells containing a nucleic acid encoding the polypeptide of claim
 2. 17. Host cells containing a nucleic acid encoding the polypeptide of claim
 3. 18. The host cells of claim 15, wherein said host cells are yeast cells.
 19. The host cells of claim 15, wherein said host cells are plant cells.
 20. A plant containing an exogenous nucleic acid encoding the polypeptide of claim
 1. 21. A plant containing an exogenous nucleic acid encoding the polypeptide of claim
 2. 22. A plant containing an exogenous nucleic acid encoding the polypeptide of claim
 3. 23. The plant of claim 20, wherein said plant is Brassica napus.
 24. The plant of claim 21, wherein said plant is Brassica napus.
 25. The plant of claim 22, wherein said plant is Brassica napus. 